Why Dog Owners Are Turning to Chamomile
Chamomile has been used medicinally for thousands of years — in teas, tinctures, topical preparations, and supplements. It's one of the most widely consumed herbal medicines in the world, used by humans to treat insomnia, anxiety, digestive upset, and inflammation. More recently, it's become a standard ingredient in veterinary calming supplements for dogs.
But does it actually work? And if so, how — and for which dogs, in which situations? This post looks at the science behind chamomile for dogs, what the research does and doesn't support, and how to use it effectively as part of a calming strategy.
What Is Chamomile?
Chamomile (Matricaria recutita, also called German chamomile) is a member of the daisy family. The active compounds most relevant to its calming effects are flavonoids — particularly apigenin — and terpenoids including chamazulene and bisabolol. These compounds work through several distinct mechanisms in the body, which partly explains why chamomile has such a broad range of effects.
VCA Animal Hospitals formally recognize chamomile as a herbal ingredient used to support calm and relaxation in dogs — one of the few natural ingredients with enough documented use to have a formal veterinary profile.
The Science: How Chamomile Calms Dogs
The GABA Pathway
The most well-documented mechanism by which chamomile reduces anxiety is through apigenin's interaction with GABA receptors. GABA (gamma-aminobutyric acid) is the brain's primary inhibitory neurotransmitter — it quiets neural activity and reduces the transmission of anxiety and fear signals throughout the nervous system.
Apigenin interacts with receptors in the brain that play a role in managing stress responses — and it does so gently, without the side effects associated with stronger medications. A 2009 randomised controlled trial in humans found that oral chamomile extract produced modest but statistically significant anxiolytic effects in people with generalized anxiety disorder, with effects mediated through this GABA pathway. While species differences mean human research can't be directly applied to dogs, the mechanism is broadly conserved across mammals.
Cortisol and the Stress Response
Chamomile has been associated with lower cortisol levels — the primary stress hormone — in both human and animal research. Cortisol is the downstream product of the HPA (hypothalamic-pituitary-adrenal) axis activation that occurs during stress. Chronically elevated cortisol in dogs is associated with immune suppression, digestive upset, and worsening of anxiety symptoms over time. An ingredient that helps lower cortisol doesn't just make a dog feel calmer in the moment — it may help break the cycle that keeps anxious dogs chronically stressed.
Anti-Inflammatory and Antispasmodic Effects
Chamomile's anti-inflammatory compounds — particularly chamazulene — reduce inflammation in smooth muscle tissue. This is relevant to anxiety because stress and anxiety in dogs frequently manifest as digestive upset: loose stools, gurgling intestines, reduced appetite, and vomiting. The gut-brain axis is well established in veterinary medicine — gut distress worsens anxiety, and anxiety worsens gut distress. Chamomile's antispasmodic effects address both the gut symptoms and, indirectly, the anxiety they amplify.
What the Evidence Actually Shows
It's worth being honest about the state of the evidence. Most research on chamomile's calming effects has been conducted in humans or rodent models, not in dogs specifically. Direct canine clinical trials are limited. A 2026 review from researchers at Captain Calm notes that chamomile — along with most traditional calming botanicals — has "surprisingly little direct canine evidence despite widespread use."
What we do have is a plausible, well-characterized mechanism (GABA receptor binding via apigenin), significant veterinary clinical experience, and human trial data supporting anxiolytic effects. For dogs who seem anxious or unsettled, chamomile is one of the most well-established natural ingredients available — with a strong safety record and consistent results across a wide range of products.
For dogs with more serious anxiety, chamomile works best as part of a broader approach — alongside training, routine, and veterinary guidance where needed.
Chamomile and Passionflower: Why They're Often Combined
Chamomile and passionflower (Passiflora incarnata) are frequently combined in calming treats for dogs — including Doggijuana's Juananip with Chamomile & Passion Flower blend. This pairing makes pharmacological sense.
While chamomile's apigenin acts primarily on GABA receptors, passionflower contains chrysin and other flavonoids that modulate GABA activity through slightly different mechanisms, and also demonstrate mild MAO-inhibiting properties. The combination covers more of the GABA pathway than either compound alone, and there is clinical evidence from human studies that the combination is more effective than either herb in isolation for anxiety symptoms.
For dogs with moderate anxiety — particularly situational anxiety triggered by fireworks, thunderstorms, travel, or vet visits — this botanical combination offers a natural GABA-supporting option that can be used in the 20–30 minutes before a known stressor.
Chamomile and L-Tryptophan: Different Pathways, Complementary Effects
Chamomile works primarily through the GABA pathway. L-tryptophan — found in Juananip Bites — works through the serotonin pathway. L-tryptophan is a dietary amino acid that crosses the blood-brain barrier and is converted to serotonin, the neurotransmitter most associated with mood stability and emotional wellbeing.
These two mechanisms are complementary rather than redundant. A dog with ongoing generalized anxiety may benefit from both: chamomile (and passionflower) for acute situational calm, and L-tryptophan-containing supplements for baseline daily mood support. This dual-pathway approach is the reasoning behind using both the Chamomile & Passion Flower blend and Juananip Bites for dogs with chronic anxiety.
Is Chamomile Safe for Dogs?
Chamomile is generally well tolerated in dogs at appropriate doses. VCA Animal Hospitals note that it is used both topically and internally in veterinary practice. A small percentage of dogs — particularly those with allergies to plants in the Asteraceae family (ragweed, chrysanthemum) — may be sensitive to chamomile. It is not recommended for pregnant or lactating dogs.
If your dog is on any prescription medication, consult your vet before adding any herbal supplement. Chamomile's mild anticoagulant properties (due to coumarin compounds) are theoretically relevant if your dog is on blood-thinning medications.
The easiest and most reliable way to give your dog chamomile is through a treat specifically formulated for dogs — not chamomile tea, which may contain other plant extracts and delivers an inconsistent amount.
How to Use Chamomile for Your Dog's Anxiety
For situational anxiety — fireworks, car travel, thunderstorms, vet visits — give your dog a chamomile-containing treat 20–30 minutes before the expected stressor. The Juananip with Chamomile & Passion Flower blend can be added to your dog's food or sprinkled into a toy pocket at this interval.
For daily calm support, two to three Juananip Bites a day is a simple, consistent way to work both L-tryptophan and chamomile into your dog's routine.
For the full picture on natural calming approaches for dogs — including the science behind catnip, scent enrichment, and the role of routine — read our complete guide: How to Calm an Anxious Dog Naturally.
