Lavender

Is lavender safe for dogs and cats? Not to eat, and not as a concentrated oil. The ASPCA lists lavender as toxic to dogs, cats and horses because it contains linalool and linalyl acetate. A sniff of the garden plant is not an emergency. The real risk is lavender essential oil, and cats are the most vulnerable of the three.

That is the short answer. The longer one is more useful, because lavender is also one of the few scents with real research behind it for calm in dogs and horses. Both things are true: the oil can harm, and the scent, used carefully, has been studied. Here is how to tell the difference.

Is Lavender Toxic to Dogs and Cats?

The ASPCA’s plant database lists lavender (Lavandula angustifolia) as toxic to dogs, cats and horses. The toxic principles are linalool and linalyl acetate, two aromatic compounds that give lavender its smell. Linalool is one of the terpenes you will also see on hemp lab reports.

The clinical signs the ASPCA lists for the plant are mild: nausea, vomiting (not in horses) and loss of appetite. So if your dog chewed a sprig off the lavender bush, you are usually looking at an upset stomach, not a crisis.

The picture changes with the oil. Essential oil is the plant’s aromatic compounds concentrated many times over, and it can be absorbed through the skin, swallowed during grooming, or inhaled. That is where the serious cases come from.

Why Cats Are More at Risk

Cats process many aromatic compounds poorly. The Merck Veterinary Manual explains that cats are deficient in the liver enzyme glucuronyl transferase, which other species use to break these compounds down. Grooming makes it worse: oil that lands on the coat gets licked off and swallowed.

This is the same reason our cat safety guide treats most essential oils with caution. It is also why the answer to “is lavender safe for cats” is more conservative than the answer for dogs.

Plant vs Oil vs Scented Products

• Fresh or dried plant. Toxic by ASPCA listing, but signs from nibbling are usually mild stomach upset. Keep potted lavender out of reach of cats who chew plants.

• Essential oil. The form to take seriously. Never apply it undiluted to a pet, and do not let a pet lick it off skin or furniture.

• Diffusers. Pet Poison Helpline separates two kinds. Passive diffusers (reeds, heat, evaporative pads) mainly cause respiratory irritation. Active diffusers (nebulizing and ultrasonic) put out microdroplets of oil that settle on fur, where they are absorbed or groomed off, which makes them the bigger risk.

• Sprays, shampoos and candles. Diluted products carry less oil per exposure, but the same rule applies: less concentration, less time, more ventilation.

The ASPCA’s view on diffusers is practical: a short session in a room your dog or cat cannot get into is not likely to be an issue. Merck’s prevention advice is similar: keep pets away from diffusers, use only diluted products, and keep diffuser use under 30 minutes.

Other Essential Oils to Keep Away From Pets

Lavender sits in the middle of the essential-oil risk range. PetMD’s essential oil guide lists lavender, chamomile, rosemary, ginger, frankincense, myrrh and bergamot as oils dogs may tolerate with precautions. It lists these as oils dogs should avoid:

• Cinnamon, clove and hyssop

• Citrus oils and lemongrass

• Pennyroyal, pine, sweet birch and wintergreen

• Peppermint and tea tree

• Ylang ylang

“Tolerated” is not the same as safe for cats. The feline liver issue described above applies to most oils, including the gentler ones. Our eucalyptus and cinnamon entries cover two more common household scents.

What the Calming Research Shows

Lavender is one of the few scents that has been tested on animals under controlled conditions. The results are worth reporting accurately, including where they came up empty.

• Shelter dogs. Graham, Wells and Hepper exposed 55 dogs in a rescue shelter to lavender, chamomile, rosemary, peppermint or no odor (Applied Animal Behaviour Science, 2005). With lavender and chamomile, the dogs spent more time resting, less time moving and vocalized less. Rosemary and peppermint did the opposite.

• Trailered horses. Heitman and colleagues ran a crossover study in 8 horses on 15-minute trailer rides, with lavender or water as the control (Journal of Equine Veterinary Science, 2018). Cortisol rose less with lavender, a statistically significant difference. Heart rate did not differ.

• Shelter cats. Ellis and Wells (2010) offered 150 shelter cats cloths scented with lavender, catnip, rabbit scent or nothing. Only catnip drew significantly more interaction. Lavender produced no notable effect.

Those are small studies, and they tested scent, not ingested lavender and not oil on the coat. They support the idea that lavender smell can help some dogs and horses settle. They do not support putting lavender oil on a pet, and they give no reason to use lavender on cats at all.

Dogs, Cats and Horses

Dogs handle the plant better than cats, and they are the species with the most calming evidence. If you use lavender scent for a dog, keep it passive, brief and in a room the dog can leave. A diluted spray on bedding the dog does not chew is lower risk than oil on the collar.

Cats are the reason for caution. They lack the liver pathway to clear these compounds well, they groom oil off their coats, and the one cat study found lavender did nothing for them. Keep lavender oil and active diffusers away from cats. A lavender plant can live in a cat home if it is somewhere the cat cannot reach or chew.

Horses are also on the ASPCA’s toxic list, but horses cannot vomit, so the listed signs are nausea and loss of appetite. The trailer study is the most encouraging lavender research in any species, and it fits with how many owners think about trailering and travel stress: use scent around the horse, not on it, and do not add oil to feed.

Signs of Lavender or Essential Oil Toxicity

Merck and Pet Poison Helpline describe a range of signs after essential oil exposure:

• Drooling, vomiting, loss of appetite

• Lethargy or depression

• Wobbliness (ataxia) or tremors

• Breathing difficulty, coughing, watery eyes and nose

• Low heart rate or low body temperature

• In severe cases, liver injury

Signs can appear within minutes to hours. Cats with respiratory irritation may sit hunched and breathe with effort.

What To Do If Your Pet Was Exposed

• Move them to fresh air and turn off any diffuser.

• Do not make them vomit. Merck notes that inducing vomiting after essential oil exposure risks aspiration into the lungs.

• If oil is on the coat, wash it off with mild soap and water, and stop your pet grooming it until it is off.

• Call your vet or a poison line with the product name and how much was involved: ASPCA Animal Poison Control at (888) 426-4435 (a consultation fee may apply) or Pet Poison Helpline at (855) 764-7661 ($89 per incident).

A dog who ate a few lavender leaves and seems fine usually just needs watching. A cat who licked oil or sat next to a running nebulizer needs a call now.

When to Call Your Veterinarian

Call right away for any oil ingestion, oil on the coat of a cat, trouble breathing, tremors or wobbliness. Call the same day if vomiting continues or your pet will not eat. Also check in before using any scent product with a pet who has asthma, liver disease or a history of seizures, or with birds in the house, which the ASPCA says should not be around diffusers at all.

Calmer Alternatives to Lavender Oil

If you reached for lavender to settle a nervous pet, there are options with less oil risk. Maple Grove Pet Hospital suggests vet-approved calming chews, pheromone diffusers, anxiety vests, behavior training and, when needed, prescription medication. The same clinic flags puppies, small breeds, seniors and pets with liver or breathing problems as the ones to keep furthest from lavender oil.

• Dogs: predictable routines, a quiet den, pressure wraps and training for noise or separation stress. Ask your vet about medication for severe fear.

• Cats: catnip was the only scent that drew real interest in the shelter study above. Hiding spots, high perches and a feline pheromone diffuser are the low-risk basics.

• Horses: keep lavender as scent near the horse, as in the trailer study, never oil in feed.

How It Fits With Hemp

Lavender and hemp share a chemical thread: linalool is one of the terpenes found in hemp, which is why you see it on a certificate of analysis. If calm is the goal, the safest way to use either is the simplest. For scent, that means brief and passive. For a daily routine, a measured product given with food is easier to control than oil in the air. Our calming support collection includes hemp options for dogs, cats and horses that support calm, alongside ingredients like valerian root and L-theanine.

Frequently Asked Questions

Is lavender safe for dogs?

The plant is listed as toxic by the ASPCA, but a nibble usually means only a mild upset stomach. Lavender oil is the real risk. Brief, passive scent in a room your dog can leave is the lower-risk way to use it.

Is lavender oil safe for cats?

No. Cats lack the liver enzyme needed to break down its compounds, and they groom oil off their coats. Keep lavender oil and active diffusers away from cats.

Is lavender scent safe for cats?

A faint scent in another room is very different from a diffuser running beside the cat. If you use lavender at home, keep it brief, ventilated and out of any room the cat cannot leave, and skip active diffusers entirely.

Can I have a lavender plant in my house with a cat?

Yes, if the cat cannot reach or chew it. The ASPCA lists the plant as toxic, with mild signs such as vomiting and loss of appetite. Cats who chew houseplants should not share a room with it.

Do cats know to stay away from lavender?

Don’t count on it. Many cats seem to avoid strong scents, but there is no good evidence that cats reliably avoid lavender, and curious cats do chew plants. Placement is safer than hoping.

Do cats like lavender?

In the only controlled study we found, 150 shelter cats showed no notable interest in lavender-scented cloths. Catnip was the only scent they engaged with significantly more.

Are cats allergic to lavender?

The concern is toxicity, not allergy. Lavender’s compounds are hard for a cat’s liver to clear, so the risk rises with dose and concentration, especially from oil.

Is lavender scented litter toxic to cats?

We could not find veterinary data on lavender-scented litter specifically. The fragrance in litter is far less concentrated than essential oil, but cats spend time with their faces near it. If your cat sneezes, avoids the box or eliminates elsewhere, switch to unscented.

Can lavender calm my dog?

In a 2005 study of 55 shelter dogs, lavender scent was linked with more resting and less barking. That was scent in the air, not oil on the dog. Use it the same way.

Can I put lavender oil on my dog?

We wouldn’t. PetMD advises never applying essential oils directly to a dog’s skin, coat, mouth or ears, and the Merck Veterinary Manual says not to apply concentrated oils to pets. Dogs lick it off, and it can irritate skin.

What essential oils are toxic to dogs?

PetMD’s avoid list includes cinnamon, clove, citrus, pennyroyal, peppermint, pine, sweet birch, tea tree, wintergreen, ylang ylang, hyssop and lemongrass. Lavender is on its “use with precautions” list, not its safe list.

How do vets treat lavender oil poisoning?

There is no antidote. Merck describes supportive care: washing oil off the coat or moving the pet to fresh air, fluids, stomach-protecting and liver-protecting medications, and oxygen or seizure control if needed. Bloodwork helps check the liver. Vomiting should not be induced.

Is dried lavender safe around pets?

Dried lavender carries the same compounds as the fresh plant, in smaller amounts than oil. Sachets and bundles are low risk if they are out of reach; a cat or puppy that chews one may vomit.