Dog Microbiome and Welfare: Diet and Gut Health

Emerging research on the canine gut microbiome reveals connections between diet, gut health, and behavioral and physical welfare in companion dogs.

Key Facts

The canine gut microbiome contains trillions of bacteria that influence immune function, mood, and digestion
Diet is the primary determinant of microbiome composition in dogs
Highly processed commercial diets may reduce microbiome diversity compared to whole-food or raw diets
Antibiotic treatment causes significant and sometimes lasting disruption to the canine gut microbiome
Gastrointestinal symptoms, anxiety, and immune dysregulation may be linked to microbiome imbalance

Welfare Considerations

The gut-brain connection in dogs has welfare implications that are only beginning to be understood. A healthy, diverse microbiome appears to support both physical health and emotional resilience in dogs. Factors that disrupt microbiome health — highly processed diets, overuse of antibiotics, chronic stress — may contribute to welfare-negative states including gastrointestinal discomfort, anxiety, and immune vulnerability. While the science is still developing, providing dogs with diverse, minimally processed diets and minimizing unnecessary antibiotic use are welfare-positive practices supported by emerging evidence.

What You Can Do

Consult your veterinarian about diet options that support microbiome diversity for your dog
Avoid unnecessary antibiotic use and request probiotics after antibiotic courses
Learn about the research on diet and microbiome health to make informed feeding decisions
Support canine microbiome research through veterinary school donation programs