If your dog or cat has swallowed essential oil, or had it put on their skin or fur, stop reading and call a vet. Do not wait to see whether symptoms appear, and do not try to make them vomit. In Canada and the US the Pet Poison Helpline (855-764-7661) and the ASPCA Animal Poison Control Center (888-426-4435) both take calls around the clock; a consultation fee usually applies.
Everything below is for the ordinary version of this question — someone who has a bottle of lavender oil, a dog or a cat, and wants to know where the line is.
The short answer
We grow and distil lavender for a living, so it would be convenient for us to say it is all fine. It is not.
- Never put essential oil on a dog or a cat, diluted or not.
- Never let them drink it or lick it — including off your own skin.
- Diffusing is lower risk than contact, but it is not no risk, and for cats a good many vets advise against it entirely.
- Cats are more vulnerable than dogs, for a specific biological reason worth understanding.
Why animals are not just small people
Three things stack up.
Concentration. Essential oil is the concentrate pulled out of an enormous quantity of plant. A dose that reads as pleasant to a 70 kg human is a very different dose to a 4 kg cat.
Metabolism. This is the important one, and it is why cats are a separate case. Cats have very limited glucuronidation — a liver pathway mammals use to process and clear many plant compounds, including those in essential oils. What a dog's liver clears, a cat's liver clears slowly or not at all, so it accumulates. This is the same reason cats cannot have paracetamol.
Grooming. Anything that lands on a cat's coat ends up in a cat's mouth. There is no such thing as topical-only on an animal that washes itself.
Dogs
On the skin — no. You will find blogs recommending diluted lavender oil for a dog's coat or anxiety. Do not do it without a vet who knows your animal telling you to. Dogs absorb it, then lick it, and skin reactions in dogs are common.
Swallowed — no, and treat it as urgent. A knocked-over bottle is the classic scenario. Essential oils can cause chemical burns to the mouth and throat, and if any is inhaled into the lungs while vomiting it causes a serious pneumonia. This is a vet call, not a wait-and-see.
Diffused — the grey area. A diffuser running in a large, ventilated room that the dog can walk out of is a much smaller exposure than contact or ingestion. Dogs also smell somewhere in the order of ten thousand times better than we do, so what reads as subtle to you may be overwhelming to them.
If you diffuse with a dog in the house: keep it to one room, leave the door open, never run it in a crate or a closed space, and keep the diffuser somewhere it cannot be knocked over. If your dog leaves the room, let them. That is them telling you.
Cats
Everything above applies, and then more.
Because of the metabolic gap, cats are considered at meaningfully higher risk from essential oils than dogs are. Lavender is on the ASPCA's list of plants toxic to cats, dogs and horses. Repeated low-level exposure matters for cats in a way it does not for us, because clearance is the bottleneck.
Never apply it. Never let them ingest it. That includes licking a spot where you applied a diluted blend to yourself.
On diffusing: a lot of veterinary guidance is simply do not, in a house with cats. Some vets will accept a well-ventilated room the cat can leave, run briefly. Ask yours rather than us — they know your cat, and they will have an opinion.
Water-based diffusers that disperse micro-droplets are riskier than passive reed diffusers, because droplets settle onto fur.
What about hydrosol?
A hydrosol is far less concentrated than essential oil — it is the water from the same distillation rather than the oil.
Less concentrated is genuinely less risky. It is not the same as proven safe, and there is very little research on hydrosols in companion animals. So our position is the boring one: do not use it on your pet, do not add it to their water, and do not spray it on the bed they sleep in or the spot they groom. Around the house, away from where they lie, it is a much smaller thing than the oil.
Dried lavender, sachets and bouquets
The dried plant is a smaller problem than the oil, but it is not nothing — the compounds that make lavender toxic to pets are in the plant too, just far less concentrated.
A cat brushing past a bouquet is not a concern. A dog that eats a whole sachet may well get an upset stomach, and a large amount can cause more than that. If you have a chewer, keep sachets in drawers rather than on low shelves, and put bouquets somewhere out of reach.
Signs something is wrong
After any exposure, watch for:
- Drooling, or pawing at the mouth or face
- Vomiting or refusing food
- Wobbliness, weakness or unusual lethargy
- Difficulty breathing, or coughing
- Tremors or muscle twitching
- Redness or burns around the mouth, or on skin where oil landed
- Smelling of the oil — which tells you where it went
Any of these after a known exposure is a vet call. Take the bottle with you so they can see the ingredients.
Where we stand
We do not make pet products and we do not make claims about animals. Our essential oils and hydrosols are for people, their homes and their linen.
We would rather lose a sale to a cat owner than have someone assume that because it is natural, and because it came from a farm, it must be fine for every creature in the house. Natural and safe are not the same word. Nicotine is natural.
If you live with animals and you want lavender in the house, the lower-risk routes are the ones with no airborne oil in them: a dried bouquet somewhere high, a soap you rinse off, or a sachet in a closed drawer.
This is general information from a lavender farm, not veterinary advice. Your vet knows your animal and we do not — ask them.