Emotion, Pain, & Sentience

The use of infra-red thermography to study emotions of wild crested macaques (Macaca nigra) in their natural habitat

Infra-red thermography (IRT) has been validated across a range of taxa as a non-invasive method to quantify physiological changes (variation in skin temperature) that serve as a proxy for emotional arousal in humans and other animals. While its effectiveness has...

Year Published: 2025Topics: Emotion, Pain, & Sentience, Welfare AssessmentAnimal Type: Macaque, Nonhuman Primate

Citation: Berthier, J. M., Wheeler, B. C., Qomariah, I. N. et al. 2025. The use of infra-red thermography to study emotions of wild crested macaques (Macaca nigra) in their natural habitat. Physiology & Behavior 296, 114904.

Pain and pessimism affect calves’ play behaviours post-disbudding

Calves are expected to play less when in pain, and more pessimistic individuals may be more affected by painful events, such as hot-iron disbudding (i.e., horn-bud removal). We explored 1) the impact of disbudding on different play behaviours, predicting that...

Year Published: 2025Topics: Body Modification/Mutilation, Emotion, Pain, & SentienceAnimal Type: Cattle

Citation: St John Wallis, A., Held, S. D. E., Mendl, M. T. et al. 2025. Pain and pessimism affect calves’ play behaviours post-disbudding. Discover Animals 2(1), 50.

Evidence of mood states in reptiles

There is increasing evidence that non-human animals experience ‘free-floating’ mood states, but such evidence is lacking in reptiles, hindering the debate as to their affective capacity and with subsequent implications for welfare. Here, we investigated the presence of a mood...

Year Published: 2025Topics: Emotion, Pain, & SentienceAnimal Type: Reptile, Turtle & Tortoise

Citation: Hoehfurtner, T., Wilkinson, A., Moszuti, S. A. et al. 2025. Evidence of mood states in reptiles. Animal Cognition 28(1), 52.

From Fish to Mice to Monkeys in Research: Challenges and Opportunities for Mental Well-being

This chapter focuses mainly on animals in medical research. Many, especially the smaller species such as rat, mice, and zebrafish, may be seen only a few minutes a day by their human caregivers. Most laboratory animals are kept in confinement...

Year Published: 2025Topics: Abnormal/Problematic Behavior, Emotion, Pain, & Sentience, Environmental Enrichment, Handling, Housing, Human-Animal Interaction, Husbandry & Management, Natural Behavior, Regulations & Ethical Review, Social Housing & CompanionshipAnimal Type: All/General, Fish, Macaque, Marmoset, Mouse, Nonhuman Primate, Rat, Rodent, Zebrafish

Citation: Serageldine, C. E., Robinson-Junker, A., Alvino, G. et al. 2025. From Fish to Mice to Monkeys in Research: Challenges and Opportunities for Mental Well-being. In Mental Health and Well-being in Animals (pp. 308–322).

Mental Health and Well-being in Animals

Since the publication of the first edition of this book, professional and public concern for the well-being of animals has continued to increase throughout the world. Advances in research and technologies have yielded an enormous amount of new knowledge about...

Year Published: 2025Topics: Emotion, Pain, & Sentience, Welfare AssessmentAnimal Type: All/General, Baboon, Bird, Capuchin, Cat, Chicken, Chimpanzee, Crocodile & Alligator, Dog, Equine, Fish, Gibbon, Goat, Lemur, Lizard, Macaque, Marmoset, Nonhuman Primate, Other Animal, Other Nonhuman Primate, Owl Monkey, Parrot, Pig, Rabbit, Reptile, Salmon, Sheep, Snake, Squirrel Monkey, Trout, Turtle & Tortoise, Vervet (African Green Monkey)

Citation: McMillan, F. D. (Ed.) 2025. Mental Health and Well-being in Animals (3rd ed.). CAB International, Oxfordshire, UK. 464 p.

The ability to interpret affective states in horses’ body language is associated with experience with animals.

In light of an increasing interest in the human ability to read equine emotions, Braun et al. (2024) recently showed that horse-experienced individuals performed better in interpreting affective states in horses’ body language than horse-inexperienced individuals. Further, individuals with a...

Year Published: 2025Topics: Emotion, Pain, & Sentience, Human-Animal InteractionAnimal Type: Equine

Citation: Braun, M. N., Bülow, S., Müller-Klein, A. et al. 2025. The ability to interpret affective states in horses’ body language is associated with experience with animals. Applied Animal Behaviour Science 290, 106716.

Effects of access to a well-resourced environment on dairy calf cognition and affective state (2025)

Dairy calves are often raised without maternal contact and in environments of low complexity. Environments that limit natural behaviors are known to impair cognitive development and affective states. We explored the effect of environmental complexity on one measure of social...

Year Published: 2025Topics: Emotion, Pain, & Sentience, Environmental EnrichmentAnimal Type: Cattle

Citation: Suchon, M., Weary, D. M., Keyserlingk, M. A. G. von. 2025. Effects of access to a well-resourced environment on dairy calf cognition and affective state. PLOS ONE 20(5), e0323089.

Modifying the attention bias test to assess the emotional state of dogs (2025)

The attention bias test is an established cognitive method used to evaluate emotional states in farm animals by examining their response to a stimulus under varying emotional conditions. This study adapted this test for dogs, utilizing naturally induced emotional states...

Year Published: 2025Topics: Emotion, Pain, & Sentience, Welfare AssessmentAnimal Type: Dog

Citation: Molinaro, H. G., Smith, E., Crawford-Paz Soldán, E. et al. 2025. Modifying the attention bias test to assess the emotional state of dogs. Animals 15(6), 840.

By your side: How social support affects training duration, task performance and behaviour of pigs in a judgement bias task (2025)

Pigs (Sus scrofa domesticus) and most other farmed species are social animals for whom social isolation is known to cause stress. However, their social nature is commonly ignored in behavioural and cognitive tasks, on which they are trained and tested...

Year Published: 2025Topics: Emotion, Pain, & Sentience, Social Housing & CompanionshipAnimal Type: Pig

Citation: Kroell, M., Winckler, C., Hintze, S. 2025. By your side: How social support affects training duration, task performance and behaviour of pigs in a Judgement Bias Task. Animal Welfare 34, e25.

Defending and refining the Birch et al. (2021) precautionary framework for animal sentience (2025)

It is widely accepted that we ought to avoid taking excessive risks of causing gratuitous suffering. The practical implications of this truism, however, depend on how we understand what counts as an excessive risk. Precautionary frameworks help us decide when...

Year Published: 2025Topics: Emotion, Pain, & Sentience, Regulations & Ethical ReviewAnimal Type: Cephalopod, Invertebrate

Citation: Fischer, B., Gottlieb, J., Schnell, A. K. et al. 2025. Defending and refining the Birch et al. (2021) precautionary framework for animal sentience. Animal Welfare 34, e28.