When a dog perceives a threat — real or imagined — the amygdala fires a stress signal that triggers the release of cortisol and adrenaline from the adrenal glands. Heart rate climbs. Muscles tense. The digestive system shuts down. This is the fight-or-flight response, and it is identical in mechanism to what humans experience during acute stress.
For dogs with anxiety disorders, this response fires too easily, too intensely, or fails to switch off once the trigger has passed. Chronic cortisol elevation has real physiological consequences: suppressed immune function, gut dysbiosis, muscle tension, and behavioural changes that can become self-reinforcing over time. A dog that is chronically anxious is not simply nervous — they are physiologically dysregulated.
The goal of any calming intervention — natural or pharmaceutical — is to reduce the frequency and intensity of this cortisol response, and to help the dog's nervous system return to a baseline state of calm (the parasympathetic, or rest-and-digest mode) more readily after a stressor has passed.
Two neurotransmitter pathways are central to canine anxiety management. GABA (gamma-aminobutyric acid) is the brain's primary inhibitory neurotransmitter — it quiets neural activity and reduces the physical symptoms of anxiety. Several natural compounds, including chamomile's active ingredient apigenin and passionflower's flavonoids, are thought to interact with GABA receptors in a manner similar to pharmaceutical anxiolytics, but more gently and without sedation. Serotonin, sometimes called the wellbeing neurotransmitter, plays a complementary role — L-tryptophan, found in Juananip® Bites, is a direct precursor to serotonin synthesis.
The olfactory system offers a third pathway. Dogs have approximately 300 million scent receptors — around 50 times more than humans — and their olfactory bulb connects directly to both the limbic system (the emotional brain) and the prefrontal cortex. Sniffing is neurologically calming: it activates the parasympathetic nervous system, slows heart rate, and reduces cortisol. A 2019 study in Applied Animal Behaviour Science (Duranton & Horowitz) found that dogs who participated in regular nose work showed significantly more optimistic behaviour than dogs in conventional obedience training. The act of sniffing is, in itself, a natural anxiolytic.