18/08/2025
๐๐๐ญ๐ญ๐๐ซ ๐
๐จ๐จ๐, ๐๐๐ญ๐ญ๐๐ซ ๐๐๐ก๐๐ฏ๐ข๐จ๐ฎ๐ซ๐ฌ, ๐๐๐ญ๐ญ๐๐ซ ๐๐จ๐ ๐ฌ
Anxiety, fear and aggression in dogs is complex. It isnโt solved by just one thing โ itโs a psycho-physiological condition influenced by both body and mind. One important and often underrated pathways in influencing behaviour is the ๐๐ข๐กโ๐๐๐๐๐ ๐๐ฅ๐๐ .
๐ง ๐ป๐๐ ๐ฎ๐๐โ๐ฉ๐๐๐๐ ๐จ๐๐๐
The gut and brain communicate through the vagus nerve โ the bodyโs longest nerve, stretching from the brainstem to the abdomen. This nerve regulates swallowing, heart rate, breathing, gut motility, and gland secretion as part of the autonomic nervous system, which balances:
โช๏ธSympathetic tone (fight or flight)
โช๏ธParasympathetic tone (rest and digest)
Because dogs and humans share similar neurotransmitters, the same drugs (e.g. Prozac, trazodone) can work in both species.
Up to 90% of serotonin โ the neurotransmitter linked to mood, memory, and wellbeing โ is produced in the gut. This is why the gut is often called the โsecond brain.โ Stress can affect the gut (e.g. dogs exhibiting stress diarrhoea after moving house), and the gut can affect the brain through the activity of the microbiome.
๐ฆ ๐ป๐๐ ๐ด๐๐๐๐๐๐๐๐๐ ๐๐๐
๐ฉ๐๐๐๐๐๐๐๐
The microbiome is made up of bacteria, fungi, viruses, and their genes. Different microbial populations live in the mouth, skin, nasal passages, urinary tract, and gut โ but the gut microbiome has the most profound impact on behaviour.
Gut microbes communicate with the brain via the vagus nerve. They produce metabolites and neurotransmitters that directly influence mood, resilience, and emotional stability.
โช๏ธA healthy microbiome supports a strong gut lining (epithelium) and balanced immunity.
โช๏ธDysbiosis (imbalance of microbes) is linked to gastrointestinal issues and behavioural problems such as: separation anxiety, reactivity, aggression, excessive licking/barking, hyperactivity, coprophagia, allergies, and reduced stress resilience.
Stress itself can worsen dysbiosis, creating a cycle of imbalance.
Since 75โ80% of the immune system resides in the gut (in gut-associated lymphoid tissue), maintaining microbial diversity is crucial.
โ๏ธ ๐ต๐๐๐๐๐๐๐๐, ๐ฎ๐๐ ๐ฏ๐๐๐๐๐ & ๐จ๐๐๐๐๐๐
Diet plays a major role in shaping the microbiome and behaviour:
โช๏ธ๐๐ข๐ ๐ก ๐๐๐ซ๐๐จ๐ก๐ฒ๐๐ซ๐๐ญ๐ ๐๐ข๐๐ญ๐ฌ (such as kibble, often 30โ60% carbs) can spike blood sugar, leading to hyperactivity. Low blood sugar that follows can impair brain function, sometimes triggering aggression. Carbohydrate-driven inflammation also worsens anxiety.
โช๏ธ๐๐ฆ๐๐ ๐-๐๐ฌ (๐๐๐ & ๐๐๐) are vital for brain health. Low DHA has been linked to aggression in dogs. Choose clean, sustainable sources (marine algae, green-lipped mussel) to avoid heavy metals.
โช๏ธ๐๐๐ ๐จ๐ข๐ฅ supports cognition in senior dogs and may reduce anxiety.
โช๏ธ๐ ๐ฏ๐ข๐ญ๐๐ฆ๐ข๐ง๐ฌ (especially B6 and riboflavin) are essential for serotonin synthesis.
โช๏ธ๐๐๐ ๐ง๐๐ฌ๐ข๐ฎ๐ฆ regulates neurotransmitters and promotes calmness.
โช๏ธ๐๐ข๐ง๐ ๐๐ง๐ ๐ข๐ซ๐จ๐ง are required for normal brain function โ deficiencies are linked with aggression, destructive behaviour, and fearfulness.
Protein balance matters, too:
โช๏ธ๐๐ซ๐ฒ๐ฉ๐ญ๐จ๐ฉ๐ก๐๐ง is a precursor to serotonin, supporting calm mood and learning.
โช๏ธ๐๐ฒ๐ซ๐จ๐ฌ๐ข๐ง๐ is a precursor to dopamine and norepinephrine, which drive arousal, agitation, and anxiety if unbalanced.
โช๏ธSince tryptophan and tyrosine compete to cross the bloodโbrain barrier, diets too heavy in certain proteins may favour arousal chemicals over calming ones.
For raw-fed dogs with anxiety or aggression, small dietary adjustments can help:
โช๏ธFeed twice daily
โช๏ธInclude an easy-to-digest carbohydrate (e.g. sweet potato, rice if tolerated)
โช๏ธEnsure adequate B6 from natural sources like liver, or appropriate supplement (1 mg/kg)
โช๏ธOffer a small carbohydrate snack 2โ3 hrs after meals
Noticeable improvement may appear within a week, with long term results after 3 months at which the diet can be rebalanced.
๐ฑ ๐บ๐๐๐๐๐๐๐๐๐ ๐๐๐ ๐ฎ๐๐โ๐ฉ๐๐๐๐ ๐จ๐๐๐
โช๏ธProbiotics & prebiotics (including soil-based organisms and Saccharomyces boulardii)
โช๏ธFermented foods (for microbial diversity)
โช๏ธReal, species-appropriate whole foods (avoid preservatives, dyes, rancid fats, pesticides, and mycotoxins)
โช๏ธStress reduction & exercise (stress alone alters gut motility and the microbiome)
โช๏ธFecal microbiota transplant (FMT) โ early veterinary research and case reports show changes in personality, resilience, and vitality.
โช๏ธReduce environmental toxins โ pesticides, flea/tick preventatives, unnecessary antibiotics, and heavily processed foods all harm microbial diversity.
๐ฉโโ๏ธ ๐ฉ๐๐๐๐๐
๐๐๐ ๐ฎ๐๐
A full program for canine anxiety should combine nutrition, gut health, complementary therapies (acupuncture, massage, herbs, nutraceuticals, pheromones, CBD, mushrooms), and training.
Training gives dogs safety, boundaries, and partnership. But the foundation of calm behaviour often begins in the gut.
๐ ๐ป๐๐๐๐๐๐๐: For dogs with anxiety, the gutโbrain axis should be a central focus of care. By supporting microbiome diversity, balancing nutrition, and reducing toxins, we can help build emotional resilience โ and a calmer, healthier companion.
