Access to veterinary care: evaluating working definitions, barriers, and implications for animal welfare

Humans have a moral obligation to meet the physical and mental needs of the animals in their care. This requires access to resources such as veterinary care, which is integral to achieving animal welfare. However, "access" to veterinary care is not always homogenous across communities and currently lacks a consistent definition. The objectives of this scoping review were to (1) understand how "access" to veterinary care has been defined in the literature, (2) map a broad list of potential barriers that may influence access to veterinary care, and (3) identify how access to care impacts the welfare of companion and livestock animals. The literature search yielded a total of 1,044 publications, 77 of which were relevant to our inclusion criteria, and were published between 2002 and 2022. Studies were most frequently conducted in the United States (n = 17) and Canada (n = 11). Publications defining access to veterinary care (n = 10) or discussing its impacts on animal welfare (n = 13) were minimal. However, barriers to accessing veterinary care were thoroughly discussed in the literature (n = 69) and were categorized into ten themes according to common challenges and keywords, with financial limitations (n = 57), geographic location (n = 35), and limited personnel/equipment (n = 32) being the most frequently reported. The results of this scoping review informed our proposed definition of access to veterinary care. Additionally, our findings identified a need to further investigate several understudied barriers relating to access to care (i.e., veterinarian-client relationship, client identity) and to better understand how they potentially affect animal welfare outcomes.

A critical review of advancement in scientific research on food animal welfare-related air pollution

Air pollution generates hazardous pollutants that have resulted in safety, health, and other welfare issues of food animals. This paper reviewed scientific research advancement in food animal welfare-related air pollution based on 219 first-hand research publications in refereed journals (referred to as "RPs") over the past nine decades. Scientific studies in this area began in the 1930s. The number of RPs has increased significantly with each decade from the 1960s to the 1980s, then decreased until the 2010s. Twenty-six countries have contributed to this multidisciplinary research. About 52% of the studies were conducted in the U.S. and U.K. Research activities have surged in China since the 2010s. On-farm discoveries in air toxicity that resulted in animal death or injury were all from observational studies. About 75% of the studies were experimental and conducted primarily under laboratory conditions. Ammonia (NH₃) was the main pollutant in 59% of the RPs, followed by dust, hydrogen sulfide (H₂S), bacteria and endotoxins, carbon dioxide (CO₂), carbon monoxide (CO), silo gas, sulfur dioxide (SO₂), and odor. Approximately 23% of RPs reported multiple pollutants in the same study. The most intensively studied animal species were poultry (broilers, hens, turkeys, ducks, and eggs and embryos in 44% of the RPs) and pigs (also 44%), followed by cattle, and sheep and goats. Scientific investigations in this area were driven by the research focuses in the areas of animal agriculture and industrial air pollution. Some major research teams played important roles in advancing scientific research. However, research in this area is still relatively limited. There is a great need to overcome some technical challenges and reverse the trend of decreasing research activities in North America and Europe.

Acquisition of a Joystick-Operated Video Task by Pigs (Sus scrofa)

The ability of two Panepinto micro pigs and two Yorkshire pigs (Sus scrofa) to acquire a joystick-operated video-game task was investigated. Subjects were trained to manipulate a joystick that controlled movement of a cursor displayed on a computer monitor. The pigs were required to move the cursor to make contact with three-, two-, or one-walled targets randomly allocated for position on the monitor, and a reward was provided if the cursor collided with a target. The video-task acquisition required conceptual understanding of the task, as well as skilled motor performance. Terminal performance revealed that all pigs were significantly above chance on first attempts to contact one-walled targets (p < 0.05). These results indicate that despite dexterity and visual constraints, pigs have the capacity to acquire a joystick-operated video-game task. Limitations in the joystick methodology suggest that future studies of the cognitive capacities of pigs and other domestic species may benefit from the use of touchscreens or other advanced computer-interfaced technology.

Changes in Behaviour and Voluntary Physical Activity Exhibited by Sled Dogs throughout Incremental Exercise Conditioning and Intermittent Rest Days

Participation in repetitive endurance training decreases sled dogs' voluntary activity and locomotive behaviours; however, the changes in their voluntary physical activity over consecutive rest days has not been examined to assess exercise-recovery. The objective of this study was to examine the changes in behaviour and voluntary activity of sled dogs throughout repetitive incremental conditioning and intermittent rest days. Fourteen dogs (6 males, 8 females; age 3.7 ± 2.7 years; BW 21.5 ± 2.8 kg) underwent 10 weeks of conditioning. Once a week, 5-min video recordings were taken pre- and post-exercise to measure the time spent performing agonistic behaviours, chewing on the gangline, digging, jumping, lunging, posture changing, sitting, standing and lying. Additionally, voluntary physical activity was measured on a day with an exercise bout during baseline, week 4, 5 and 7 and two consecutive rest days during baseline, week 1, 4, 5 and 7. A repeated-measures mixed model was used to analyse data in SAS (v 9.4.). As dogs progressed through their conditioning, the time spent changing posture prior to an exercise bout decreased (p < 0.05), suggesting that dogs may reduce their voluntary locomotive behaviours with increasing exercise. Additionally, dogs were more active during the second consecutive rest day than the first (p < 0.05), suggesting that rest days may provide a short-term recovery period.

Investigating the effects of incremental conditioning and supplemental dietary tryptophan on the voluntary activity and behaviour of mid-distance training sled dogs

Serotonin is a neurotransmitter synthesized by the amino acid tryptophan, that has the potential to impact the behaviour and activity of dogs. The objective of this study was to assess the effects of supplemental tryptophan and a 12-week incremental training regimen on the voluntary activity and behaviour of client-owned Siberian Huskies. Sixteen dogs were blocked for age, BW and sex and then randomly allocated to either the control or treatment group. Both groups were fed the same dry extruded diet; however, the treatment group were supplemented with tryptophan to achieve a tryptophan: large neutral amino acid ratio of 0.075:1. Once a week, a 5-minute video recording was taken immediately pre- and post- exercise to evaluate dogs' behaviours. Activity monitors were used to record voluntary activity on both training and rest days. Linear regression analysis was used to assess the relationship between training week and time spent performing each behaviour. Additionally, a repeated measure mixed model was used to test differences between diet groups and training week for both behavioural and activity count data. The time spent performing agonistic behaviours prior to exercise was negatively associated with week for treatment dogs (β = -0.32, 95% CI [-0.55, -0.10], P < 0.05) and no change was observed for control dogs (β = -0.13, 95% CI [-0.41, 0.15], P > 0.10). Treatment did not have any effect on activity levels (P > 0.10). For all dogs, locomotive behaviours decreased prior to exercise as weeks progressed (P < 0.05), while run day voluntary activity depended on the distance run that day (P < 0.05). These data suggest that sled dogs experience an exercise-induced reduction in voluntary locomotion in response to both single bouts and repetitive bouts of exercise. Additionally, tryptophan supplementation may decrease agonistic behaviours, without having any effect on voluntary activity.

Evaluating the validity and reliability of a visual dental scale for detection of periodontal disease (PD) in non-anesthetized dogs (Canis familiaris)

Periodontal disease is one of the most common conditions affecting companion dogs. The objectives of this cross-sectional study were: to determine 1) the agreement between visual assessments (VA) of periodontal disease (PD) performed on awake dogs and the reference standard (RS) of a dental examination and radiographs performed with the dog under general anesthesia, and 2) inter-rater reliability (IRR) for two individuals performing VAs of PD on the same dogs. One hundred and eight dogs were recruited from three veterinary practices. An oral examination and visual PD staging based on the American Veterinary Dental College’s (AVDC) 5-point scale was performed by the investigators prior to general anesthesia and the dental procedure. After the anesthetic evaluation and radiographs, the attending veterinarian staged each dog based on the AVDC’s 5-point scale. Agreement between the VA and RS as well as IRR were determined using percent agreement and a weighted kappa statistic. Eighty-nine dogs received a complete oral examination under general anesthesia with periodontal probing and full-mouth radiographs. Fifty-nine dogs received a VA by both raters. VA agreed with the RS 41.57% of the time with a weighted kappa of 0.42 (95% confidence interval 0.29–0.55), indicating moderate agreement. Between raters, VA agreed 61.02% of the time with a weighted kappa of 0.63 (95% confidence interval 0.49–0.76), indicating substantial IRR. The results of this study reinforce the idea that an oral examination in an awake dog can be a helpful screening tool, but should not be considered a comprehensive evaluation of periodontal health. In facilities housing large numbers of dogs such as shelters, breeding kennels, and research facilities, use of a VA can aid in identifying and prioritizing dogs most in need of procedures such as professional cleaning, periodontal treatment, including closed root planing, or surgical care.

US Residents' Perceptions of Dog Welfare Needs and Canine Welfare Information Sources

The extent to which welfare needs of breeding dogs are met in commercial dog-breeding kennels is a potential point of controversy. This analysis sought to understand US residents' perceptions and priorities related to dog welfare : by investigating (a) perceptions of breeding-dog welfare needs and (b) perceptions of various nonhuman animal welfare information sources. Using best/worst-choice experiments conducted in an online survey, respondents' choices for most and least important breeding-dog welfare needs (n = 508) and most/least trusted canine welfare information sources (n = 508) were analyzed. The survey sample was targeted to be representative of the US population in terms of gender, age, region of residence, income, and education. The largest preference shares (relatively most important) for breeding-dog welfare needs were for "availability of food and water" (39.2%) and health/veterinary care (18.1%). The largest preference shares (relatively most trusted sources) for welfare information were American Society for the Prevention of Cruelty to Animals, a veterinarian, and American Veterinary Medical Association, with 25.1%, 16.4%, and 14.1% shares, respectively.

A cross-sectional study to estimate prevalence of periodontal disease in a population of dogs (Canis familiaris) in commercial breeding facilities in Indiana and Illinois

The objectives of this cross-sectional study were: 1) to estimate the prevalence and characterize the severity of periodontal disease in a population of dogs housed in commercial breeding facilities; 2) to characterize PD preventive care utilized by facility owners; and 3) to assess inter-rater reliability of a visual scoring assessment tool. Adult dogs (N = 445) representing 42 breeds at 24 CB facilities in Indiana and Illinois were assessed. Periodontal disease was scored visually using the American Veterinary Dental Collage 0-IV scale. Inter-rater reliability was assessed on 198 dogs and facility owners were asked to provide information about the preventive care utilized. The overall prevalence of periodontal disease (Grades I-IV) was 86.3% (95% CI: 82.9, 89.3). An ordered logistic regression analysis found age (OR = 1.4; 95% CI 1.24, 1.54; P<0.0001), facility (OR = 1.13; 95% CI 1.09, 1.18; P<0.0001), sex (OR = 1.7; 95% CI 1.12, 2.65; P = 0.013), and non-professional dental scaling (OR = 2.82; 95% CI 1.34, 5.91; P = 0.006) to be statistically significant. Inter-rater reliability analysis found agreement to be 86.2%, with a weighted kappa of 0.4731 (95% CI 0.3847, 0.5615) indicating moderate agreement. Risk of periodontal disease increased with increasing age. Additionally, a trend toward decreasing risk with increasing weight was also found, although it was not statistically significant. The trends identified agree with studies that have evaluated periodontal disease in the companion dog population and do not support the assumption that the dental health of dogs in commercial breeding facilities is worse than that of the population as a whole. Although there were few cases of severe periodontal disease and all facilities employed some type of preventive care in this sample, the large number of dogs with some degree of disease (Grades I-IV) suggests that further investigation of preventive care is warranted.

Evaluating FIDO: Developing and pilot testing the Field Instantaneous Dog Observation tool

Field assessments of the health and welfare of kenneled dogs (Canis lupus familiaris) must be both accurate and rapid. In order to facilitate such evaluations, especially by individuals with limited training in canine behavior and welfare, a non-invasive tool was developed and pilot-tested utilizing dogs housed in commercial breeding facilities. Behavioral responses to approach were organized into three categories: red, indicating a fearful response to approach, green, indicating an affiliative or neutral response to approach, and yellow, indicating an ambivalent response to approach. The inter-rater reliability (IRR) of the tool when used by both behavioral experts and novice raters was evaluated with and without the presence of the dog’s familiar caretaker. Utilizing Cohen’s kappa, the experts had almost perfect levels of agreement (kappa=0.87). The novice raters had substantial levels of agreement (kappa=0.74). Overall, the dogs assessed by the novice raters had high proportions of green responses to approach and there was no statistically significant effect of caretaker presence on the proportion of green responses to approach. The assessment tool evaluated herein appears to have a high degree of IRR whether used by experts in canine behavior or by novice raters and may be a useful screening tool to determine the need for more in-depth welfare assessments.         

Perceptions of Social Responsibility of Prominent Animal Welfare Groups

Nonhuman animal welfare is an increasingly important component of consumer expectations of corporate social responsibility (CSR). The extent to which prominent animal welfare or protection organizations may influence people's perceptions of food industry CSR may be related to an organization's perceived social responsibility. Data from an online survey of 300 U.S. residents were used to explore relationships between demographics/lifestyle choices and perceptions of prominent animal welfare organizations (using best-worst scaling methodology). Overall, the American Society for the Prevention of Cruelty to Animals was perceived to be the most socially responsible organization analyzed, followed by the Humane Society of the United States and the American Humane Association (AHA). Results suggest that the perceived social responsibility of animal protection organizations in this study was not strongly linked to personally (financially) supporting them, with 2 exceptions: the perceptions of People for the Ethical Treatment of Animals and AHA. Improved understanding of the perception of animal welfare or protection organizations can inform decision making by organizations interested in furthering animal welfare causes.

Behavior and Welfare of Domestic Cats Housed in Cages Larger than U.S. Norm

The effect of providing additional floor space on cat behavior and welfare is not well documented. This study involved replication of an investigation of cats' responses to enhanced cage and room environments using cages of 0.56 m² with the same methodology but an increased space allowance of 1.1 m². Singly housed adult cats (n = 59) were randomly assigned to a treatment group that was a combination of a managed or unmanaged room and an enriched or unenriched cage environment. Cats were observed for 2 days for maintenance, affiliative, and avoidant behaviors using scan sampling and 5-min, continuous focal sampling. At the end of Day 2, cats' reactions to the approach of an unfamiliar person were assessed. Cats housed in enriched/managed environments exhibited more maintenance and affiliative behaviors and fewer avoidant behaviors than cats in unmanaged/unenriched environments, suggesting that macro and micro environments may be equally relevant to the cat. Increased space did not enhance the cats' welfare outcomes, suggesting that the provision of additional cage space may not be as important to the cat as a managed housing environment.

Effects of demographic factors and information sources on United States consumer perceptions of animal welfare

As consumers have become more interested in understanding how their food is produced, scrutiny and criticism have increased regarding intensified food animal production methods. Resolution of public concerns about animal agricultural practices depends on understanding the myriad factors that provide the basis for concerns. An online survey of 798 U.S. households was conducted to investigate relationships between household characteristics (demographics, geographic location, and experiences) and level of concern for animal welfare as well as sources used to obtain information on the subject. Because recent media attention has focused on animal care practices used in the U.S. swine industry, respondents were also asked specific questions pertaining to their perceptions of pig management practices and welfare issues and their corresponding pork purchasing behavior. Respondents reporting higher levels of concern about animal welfare were more frequently female, younger, and self-reported members of the Democratic Party. Fourteen percent of respondents reported reduction in pork consumption because of animal welfare concerns with an average reduction of 56%. Over half of the respondents (56%) did not have a primary source for animal welfare information; those who identified a primary information source most commonly used information provided by animal protection organizations, the Humane Society of the United States (HSUS), and People for the Ethical Treatment of Animals (PETA). Midwest participants were significantly, at the 5% significance level, less concerned about domestic livestock animal welfare and more frequently reported not having a source for animal welfare information than those from other regions of the United States. Overall, the U.S. livestock and poultry industries and other organizations affiliated with animal agriculture appear to be less used public sources of information on animal welfare than popular animal protection organizations. Improved understanding of the factors that contribute to consumers' evolving perceptions of the care and welfare of farm animals is an essential step toward enhanced sustainability and social responsibility in contemporary food production systems.

BIOETHICS SYMPOSIUM II: current factors influencing perceptions of animals and their welfare

To address escalating concerns about livestock animal care and welfare it is necessary to better understand the factors that may predispose people to develop such concerns. It has been hypothesized that experiences with, beliefs about, and emotional connections to animals may influence level of perceived obligation toward and therefore concern for animals. However, the extent to which people's classifications of animals and their status as pet owners may impact their views on food animal care and welfare practices remains unclear. An online survey of 798 U.S. households was therefore conducted in June 2012 to understand differences in consumer sentiment towards various animal species, classification of certain species (as pet, livestock or neither), and variations in food animal welfare concerns between dog and/or cat owners and those who do not own such species. Sixty-six percent of households in the survey owned at least 1 animal. Forty-eight percent owned dogs, 41% owned cats, 3% owned horses, and 10% owned other animals. As expected, dogs and cats were classified by most respondents (90%) as pets. Most respondents similarly categorized rabbits (58%) and horses (55%) as pets, although consensus was not found for horses with 27% classifying them as livestock animals and 18% as neither pets nor livestock. Over 80% of respondents classified beef cows, dairy cows, pigs, chickens, and turkeys as livestock. The majority of survey respondents were opposed to eating cats and dogs followed closely by horses due to ethical and/or spiritual reasons. Dog and/or cat owners more often reported having a source for animal welfare information (68%) than those who did not own these species (49%). Additionally, dog and/or cat owners were more concerned about food animal welfare for both domestically raised food animals and those raised outside the United States (dog and/or cat owners mean level of concern was 3.88 for domestic animal welfare and 5.16 for those raised outside the United States compared with non-dog or -cat owners with means of 4.46 and 5.46, respectively). Although a causal relationship cannot be established, pet ownership and increased concern for food animal welfare appear to be correlated. These data suggest that increased interest in protecting food animals may stem from interactions with and emotional connections to pets, especially when combined with other factors such as having a source for animal welfare information, education level, age, and gender.

Invited review: ruminating conscientiously: scientific and socio-ethical challenges for US dairy production

Despite the predominantly positive depictions of dairy production, public concern about farm animal production practices in the United States is currently higher than at any point in recent history. Many standard industry practices, including some used by the US dairy industries, are increasingly challenged not just on scientific grounds, but also on ethical grounds. Concerns include the environmental impacts and sustainability of modern farm animal production practices, food safety and security, and the increasingly complex issue of animal welfare. As the impetus increases to achieve broad stakeholder engagement in discussions of US food policy, understanding and addressing the ethical concerns associated with contemporary dairy production is critically important to ensure the industry's autonomy and long-term viability. Animal welfare assessment or accountability tools such as the Ethical Matrix or Campbell's Ethics Assessment Process can provide a structured, transparent method of making appropriate ethical choices about the care and welfare of farm animals that are also scientifically grounded.

A comparison of veterinary students enrolled and not enrolled in an animal-welfare course

An online survey was conducted to compare 46 veterinary students who previously enrolled in a discussion-based animal-welfare elective with 45 veterinary students who did not take the course. Students were asked a series of questions about their attitudes toward animal welfare and were presented with animal-use scenarios that had not previously been discussed in the elective course: greyhound racing, veal calf production, and the use of genetically engineered mice in research. For each scenario, students' actual knowledge was scored on the basis of open-ended factual questions. Students were also asked how comfortable they were with educating themselves about each topic and to describe factors they would use to evaluate the welfare of animals in each scenario. Factors were classified as being associated with (a) biological functioning, (b) ability to exist in a natural state, or (c) measures of affective state or feelings. There was no significant difference in actual knowledge of the three scenarios between students who took the course and those who did not. Students who took the course were significantly more likely to be comfortable about educating themselves on each of the three animal-use scenarios and scored significantly higher in identifying welfare-affecting factors than students who did not take the course. The results suggest that this approach to instruction is an effective way to teach veterinary students about how to educate themselves about animal-welfare issues and to increase their confidence in appropriately evaluating novel animal-welfare topics.

Words matter: implications of semantics and imagery in framing animal-welfare issues

As criticisms of contemporary farm-animal production escalate, scholars have begun to scrutinize the imagery and linguistic techniques used to frame animal issues and their implications. Pro-animal rights groups typically present animal use as unnecessary, oppressive, and exploitive and adopt themes of compassion and protection to engage the public. In contrast, anti-animal rights groups represent animal use as necessary for human benefit and often situate animal and human interests as being incompatible. Overly simplistic, polarized representations of animal issues therefore emerge. Several analyses, however, have indicated that the discourse on farm-animal production fails to either make a compelling ethical argument for animal agriculture or address the ethical concerns raised by animal-rights activists. Proponents of animal agriculture are argued to consistently misrepresent animal production practices and portray animals as inanimate objects, reflecting lack of genuine concern for animal suffering or welfare. Thus far, the veterinary community has escaped this level of scrutiny. However, veterinarians are often viewed as being connected to animal agriculture. As veterinarians strive to assume leadership in animal welfare, it is useful for the profession to recognize that, as is the case for members of the animal sciences and industries, some aspects of its discourse may contradict its professed values and beliefs about animal care and welfare. Analysis of this discourse affords the opportunity to more effectively engage with the public on animal-welfare issues and to develop a compelling narrative of the role of animals in an increasingly urban society.

BOARD-INVITED REVIEW: The ethical and behavioral bases for farm animal welfare legislation

Concerns about farm animal welfare vary among individuals and societies. As people increasingly consider the values underlying current farm animal production methods, farm animal welfare policy debates have escalated. Recent food animal protection policies enacted in the European Union have fueled highly contentious discussions about the need for similar legislative activity in the United States. Policymakers and scientists in the United States are apprehensive about the scientific assessment, validation, and monitoring of animal welfare, as well as the unforeseen consequences of moving too hastily toward legislating farm animal welfare. The potential impact of such legislation on producers, food prices, animals, and concerned citizens must also be considered. Balancing the interests of all stakeholders has therefore presented a considerable challenge that has stymied US policymaking. In this review, we examine the roles of ethics and science in policy decisions, discuss how scientific knowledge relative to animal behavior has been incorporated into animal welfare policy, and identify opportunities for additional refinement of animal welfare science that may facilitate ethical and policy decisions about animal care.

Defining a middle ground for philosophers and production: bioethics

From the perspective of most animal scientists and producers, animal agriculture has become increasingly contentious over the last 10 to 20 years. Furthermore, our critics seem to be extremists whose views are biased and unreasonable. But guess what? The critics say the same thing about animal producers and scientists (us). So where is the middle ground and how do we get there? Should we even worry about trying to define the middle ground? Are these contentious issues a fad that will go away? Are these "extremist" critics so far outside reason that they will be ignored by society? Ignoring "them" is not likely to work because we have seen society changing its mind (developing a new social ethic) with regard to farm animals, in part because of what these critics are saying. As a result, it is vitally important for us to know and understand what is happening and why. For example, there isn't just one voice among the critics. There is actually a spectrum of opinion among the group which conventional agriculturalists usually call their critics. The WCC-204 committee generally agrees that the key to finding the middle ground between what is perceived as a polarized set of issues between "us" (animal scientists and producers) and "them" (philosopher critics) is for both sides to learn about the reasons why each side says what they do. Only then can all parties rationally begin to identify where the middle ground lies.