Animal Welfare and the Microbiome: How Gut Bacteria Shape Wellbeing

The gut microbiome profoundly influences the physical and mental health of animals. Disruption of microbial communities through antibiotics, poor diet or stress has measurable welfare consequences across species.

Key Facts

Gut bacteria produce neurotransmitters including serotonin and GABA that directly affect brain function and mood in both humans and animals
Stress disrupts the gut microbiome within hours, reducing diversity and increasing populations of potentially harmful bacteria
Antibiotic treatment causes severe dysbiosis that can persist for months and is associated with increased anxiety and reduced resilience in animal models
Fermented foods, prebiotic fibres and reduced antibiotic use support microbiome diversity and are associated with better welfare outcomes in farmed animals
Dogs and cats show distinct microbiome profiles associated with diet quality — ultra-processed diets correlate with reduced diversity and chronic inflammation

Welfare Considerations

Microbiome science is reshaping our understanding of animal welfare. The gut-brain axis means that digestive health is directly linked to emotional states — a disrupted microbiome can cause anxiety, reduced social behaviour and impaired stress responses. For farmed animals, reducing prophylactic antibiotic use and providing microbiome-supporting diets is both a welfare measure and an antimicrobial resistance strategy. For companion animals, diet quality has measurable microbiome effects that translate into health and behavioural outcomes.

What You Can Do

Feed companion animals diets that support microbiome diversity — fresh foods, varied proteins, prebiotic-rich ingredients
Avoid unnecessary antibiotic treatment in companion animals and advocate for the same in farming contexts
Support research into the welfare implications of the gut-brain axis across farmed and wild animal species
Consider probiotic support when animals have recently received antibiotic treatment, in consultation with a vet