Emotion, Pain, & Sentience

Review of depressive-like behaviours in some group-living mammals

Thanks to animal models of depression, we are getting closer to understand the nature of this disorder in humans – but depressive disorders may not be specific only to humans. Although due to the inability to collect a verbal report...

Year Published: 2025Topics: Emotion, Pain, & SentienceAnimal Type: Baboon, Capuchin, Chimpanzee, Equine, Gibbon, Lemur, Macaque, Marine Mammal, Marmoset, Nonhuman Primate, Other Animal, Other Nonhuman Primate, Owl Monkey, Squirrel Monkey, Vervet (African Green Monkey)

Citation: Ilmer, I., Smoleń, T. 2025. Review of depressive-like behaviours in some group-living mammals. Applied Animal Behaviour Science 292, 106753.

The challenge of identifying positive emotional indicators in equids: A scoping review to evaluate if this approach is putting the cart before the horse (Equus caballus)

Driven by multiple converging factors, highlighting the negative impact of equestrian sports on equine welfare, recent scientific research has focussed on recognising positive states in horses (Equus caballus). In particular, this has yielded an increasing number of studies prioritising the...

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

Citation: Humphreys, S., Freire, R., Waran, N. et al. 2025. The challenge of identifying positive emotional indicators in equids: A scoping review to evaluate if this approach is putting the cart before the horse (Equus caballus). Applied Animal Behaviour Science 292, 106760.

Changing priorities about protective shelters: A review of a key method to investigate possible pain in crustaceans

Testing if non-human taxa experience pain is difficult because we need to exclude the possibility that responses are nociceptive reflexes. One approach is to identify an essential, high priority, resource and then ask if the animal will abandon and subsequently...

Year Published: 2025Topics: Emotion, Pain, & SentienceAnimal Type: Crustacean, Invertebrate

Citation: Elwood, R. W. 2025. Changing priorities about protective shelters: A review of a key method to investigate possible pain in crustaceans. Biology Letters 21(9), 20250342.

Single oral dose of gabapentin reduces vigilance and increases play behavior without changing mobility in New Zealand white rabbits (Oryctolagus cuniculus)

OBJECTIVE To evaluate rabbit behavioral responses and activity after gabapentin administration. METHODS In this study, 5 intact female and 3 intact male New Zealand white rabbits aged 8 to 12 months were administered a single oral 25-mg/kg dose of gabapentin....

Year Published: 2025Topics: Emotion, Pain, & SentienceAnimal Type: Rabbit

Citation: Conway, R. E., Desmarchelier, M., Burton, M. et al. 2025. Single oral dose of gabapentin reduces vigilance and increases play behavior without changing mobility in New Zealand white rabbits (Oryctolagus cuniculus). Journal of the American Veterinary Medical Association 263(3), 335–342.

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.