The lavender plant is on the ASPCA toxic list but usually means an upset stomach at most; the concentrated oil is the real risk, and here is what to do about diffusers, sprays and a dog who ate some.
Yes, on paper. The ASPCA calls lavender toxic to dogs, but the signs it lists are nausea, vomiting and going off food. A nibble out of the flower bed usually means an upset stomach at most, and so few cases have been reported that no vet can say how much it takes.
The real risk is the bottle, not the bush. Concentrated essential oil is what Merck's veterinary manual and the poison hotlines warn about, and vet-reviewed guidance calls lavender oil toxic if swallowed. Below: the plant, the oil, diffusers, sprays, the calming studies, chamomile, and what to do if your dog ate some.
They are, by the ASPCA's books, and that's where the "toxic" label comes from. Its Animal Poison Control entry for English lavender covers dogs, cats and horses, blames linalool and linalyl acetate, and lists three signs: nausea, vomiting, and a dog who goes off her food. That's the whole list.
How much does it take? Nobody knows. Dr. Chyrle Bonk, a vet writing for Dogster, says linalool only upsets a dog's stomach if she eats enough, and reports of lavender poisoning in dogs are so few that the dose range is unknown. Fresh lavender also doesn't hold the linalool concentration the oil does, so being around the fresh or dried plant is typically safer, depending on the amount. A purple-dusted snout from the border is not the problem. Half the bush might be.
Dried buds in a sachet, lavender shortbread, lavender honey? No vet source covers them or gives an amount that's fine to feed, so don't feed her lavender on purpose.
Yes, if she swallows it. Dogster's vet-reviewed guide to the oil says it in one line: lavender essential oil is toxic to dogs if ingested.
Why the oil and not the plant? Concentration. The same two molecules the ASPCA blames pile up in the bottle: a 2021 analysis in the journal Molecules found English lavender oil runs roughly 11 to 47% linalool and 7 to 44% linalyl acetate, depending on the cultivar. Merck's veterinary manual adds that essential oils are absorbed quickly through the gut, skin, lungs and mucous membranes, and the higher the concentration, the greater the risk. Pet Poison Helpline ranks the routes: swallowing is the highest risk, then skin, then breathing it in.
Oddly, lavender isn't on the vets' lists of usual oil poisonings. Pet Poison Helpline names tea tree, pennyroyal, wintergreen and pine as the most common in dogs, with concentrated products as the primary culprit. VCA's longer list (cinnamon, citrus, peppermint, ylang ylang and more) leaves lavender off too. That's not the same as a vet calling it safe. None of them does.
Not straight from the bottle, ever. Merck and VCA both say concentrated essential oil should never go directly on a pet, and the ASPCA says it's best to skip applying oils to pets altogether.
If you use a diluted product anyway, Dogster's vet-reviewed guide keeps the rules short: never where she can lick it off, never near a wound, and the smaller the dog, the more the oil has to be diluted. How much? No vet source gives a ratio, so you won't get one here. Skin irritation is the most common reaction and usually settles within 24 to 48 hours. Puppies and dogs with liver disease are more sensitive to oils, VCA notes, and its standing advice applies here: ask your vet before using any essential oil or herbal product on her.
A short session in a room your dog can't get into is, in the ASPCA's words, "not likely to be an issue." All evening beside her bed is another matter.
Reed diffusers and candles are passive: Merck's veterinary manual says they don't emit actual droplets of oil, so the hazard is the smell, unless it tips over. An active ultrasonic diffuser sends microdroplets of oil into the air, and those land on fur. The dog dozing under the desk next to it wears a fine coat of lavender oil and licks it off later.
A hint of lavender to you can be, in the ASPCA's word, overwhelming to her: PBS NOVA puts a dog's sense of smell at 10,000 to 100,000 times as potent as ours, up to 300 million scent receptors to our 6 million. Keep the diffuser where she can't reach or tip it, skip small closed rooms, and never shut her in with it: she has to be able to leave. Sensitive dogs can wheeze, cough or get watery eyes from the smell alone; if she has a history of breathing problems, the ASPCA suggests skipping it altogether. Birds have it worst; the ASPCA says their very sensitive respiratory tracts can develop more serious problems.
Shampoo is the easy one. Pet Poison Helpline says the very low concentrations in dog shampoos don't cause these poisonings; the concentrated products are the culprit, and it says to always note the concentration on the label.
On sprays, the vet sources don't say "spray the bedding, not the dog," but VCA points out that anything on her fur can end up swallowed, and the vet-reviewed rule for lavender oil is never where she can lick it off. So, the bedding. Collars get no mention at all; run the same two checks: concentration, and can it end up in her mouth? VCA's rule: ask your vet before putting any essential oil or herbal product on her.
In 2020 the FDA sent a warning letter to a company selling a pet essence called Calming Comfort, marketed for when "your pet can't relax." Unapproved new animal drugs, the FDA called its products. A lavender calming spray or collar isn't an approved drug for anxiety either; if her stress is real, that's a vet conversation.
Shelter dogs rested more and barked less on lavender days. That's the honest size of the evidence.
The study everyone quotes is from 2005: 55 shelter dogs, lavender, chamomile, rosemary or peppermint diffused 4 hours a day for 5 days. Lavender and chamomile days meant more resting and less moving and barking. Rosemary and peppermint did the opposite. Tufts' shelter-dog program suggests a few hours at set times, not too strong. A 2006 study in the American Veterinary Medical Association's journal tried lavender scent in the car with dogs who get worked up on drives: more resting and sitting, less barking and moving.
If a 2018 shelter study comes up alongside these, check the scents: vanilla, coconut, ginger and valerian. No lavender.
Your dog on the couch at home? Nobody knows. Veterinarian Chyrle Bonk puts it flatly: it remains unknown if lavender has any calming effect on dogs. The studies are small; nothing large-scale or good quality has turned up. What got tested was a smell in a room she could leave. Not oil on her coat, and not a treatment for anxiety.
Chamomile, the other half of the "lavender and chamomile" calming sprays, is on the ASPCA's toxic list too. The entry (Roman chamomile) lists contact dermatitis, vomiting, diarrhea, loss of appetite and allergic reactions, and says long-term use can lead to bleeding tendencies. Grim reading for a bedtime tea. Dr. Trina Hazzah, quoted by Great Pet Care, is less dramatic: generally safe in dogs when dosed appropriately, though not for a dog allergic to ragweed-family plants. That piece also prefers a vet-formulated product to homemade tea and calls the studies limited.
It was also in that 2005 shelter study, diffused alongside lavender, same result: more resting, less barking.
Lavender and chamomile shampoos and sprays get the same rules as any oil product: check the concentration, keep it off where your dog can lick.
Your dog can, usually as irritated skin or an allergic reaction where the oil touched her. A vet-reviewed Dogster guide calls skin irritation the most common side effect of lavender oil, and most reactions settle within 24 to 48 hours. Humans react too: linalool, one of the ASPCA's two lavender culprits, is among the 26 fragrance allergens the EU makes cosmetics label.
Red patch where oil got on her? Wash it off with liquid dish soap, and call the vet if it doesn't settle or she keeps licking at it.
Itchy skin has a long list of causes; lavender sits near the bottom.
The dog is the sturdy one here. Cats lack a liver enzyme, glucuronyl transferase, that helps clear these oils, and Merck's veterinary manual rates them more sensitive than dogs. A cat also grooms, so whatever lands on the fur gets licked off, and the plant is on the ASPCA's toxic list for cats too.
Birds have it worse with a diffuser: the ASPCA says their respiratory tracts are very sensitive and they can develop more serious problems.
First, work out what she got: a mouthful of plant, a lick of straight oil, or some product (check the label for the concentration).
Poison lines: ASPCA Animal Poison Control (888) 426-4435, a consultation fee may apply. Pet Poison Helpline (855) 764-7661, 24/7, $99 per incident.
| What happened | What to watch for | What to do |
|---|---|---|
| Nibbled fresh or dried lavender | Nausea, vomiting, going off her food | Usually watch at home; call the vet if she keeps vomiting or seems off |
| Licked or swallowed lavender essential oil | Drooling, vomiting, wobbliness, lethargy | Don't make her vomit; call the vet or a poison line, bring the bottle |
| Oil on her skin or fur | Red or irritated skin, licking the spot | Wash with liquid dish soap; call the vet if it doesn't settle in a day or two |
| Strong diffuser in her room | Coughing, watery eyes, wheezing | Fresh air right away; vet if breathing doesn't settle |
The oil bottle goes up with the bleach, like any other chemical.
Miki Rapoport·
Verified by Adam Polosetski, DVM
Tony Cairo
Tony Cairo·
Verified by Adam Polosetski, DVM