08/10/2025
Did you know your dog’s gut health might affect their behavior?
Recent research has found a strong link between the gut microbiome and issues like anxiety, fear, reactivity , and even aggression. This connection — called the gut-brain axis — works both ways: stress can alter the gut microbiome, and an unhealthy microbiome can impact brain chemistry, influencing mood and behavior.
Dogs produce serotonin in their gut NOT their brain. So if their gut is not happy they are not happy.
💡 Key takeaways:
• Dogs with aggression or anxiety often have different gut bacteria profiles than calm dogs.
• Certain bacteria may affect serotonin production, a key neurotransmitter tied to mood and impulse control. Adding a large variety of foods to your dogs diet , helps diversify the gut micro biome !
• Diet, stress, illness, and environment all play a role in shaping gut health.
• Improving gut health through a balanced diet, stress reduction, and possibly targeted probiotics may help improve behavior over time.
While this doesn’t mean probiotics are a magic fix, it highlights how physical and mental health are deeply connected.
📖 Studies to check out:
• Study on gut microbiome differences in aggressive vs. non-aggressive dogs (Oregon State University)
• Research on anxiety and gut microbiota in dogs (Nature Scientific Reports, 2025)
• Gut microbiome & serotonin levels in aggressive working dogs (MDPI Veterinary Sciences, 2025
Important note:
Behavioral challenges are complex. While gut health matters, genetics, training, environment, and past experiences are all part of the picture. If your dog is struggling with reactivity or aggression contact a reputable trainer . A lot of trainers even have some back ground in nutrition ! I myself have taken several classes and am always continuing my education on canine nutrition.