Edinburgh study finds link between gut antibody levels and canine skin allergies

Researchers at the Royal (Dick) School of Veterinary Studies, part of the University of Edinburgh, have published findings suggesting that gut immunity may play a role in canine atopic dermatitis (CAD), one of the most common long-term skin conditions in dogs. The study, funded by BSAVA PetSavers and published in the Journal of Small Animal Practice, compared faecal and saliva samples from dogs with CAD against healthy dogs seen at the university's small animal hospital.

The team found that dogs with CAD had significantly lower levels of immunoglobulin A (IgA), an antibody that helps protect the gut lining, in their faeces than dogs without the condition. Saliva IgA levels, by contrast, showed no meaningful difference between the two groups, and the two measures did not track each other within individual dogs. Neither measure was linked to the dog's age or breed in this study. The lead researcher, Dr Francesca Soutter, said the work points to a potential role for gut mucosal immunity in CAD that may extend beyond food allergy, which has traditionally been the main suspected trigger.

Canine atopic dermatitis is a lifelong, inherited condition that affects a wide range of breeds and can cause considerable discomfort through itching, skin infections, and recurring flare-ups. The study was small, with 32 affected dogs and 36 controls, so its authors are calling for larger follow-up studies, including ones that track high-risk breeds from birth. For now, the findings add a useful piece to the wider picture of what drives the condition, which may in time help vets and researchers develop better ways to manage or reduce its impact.