Yes, lavender is toxic to dogs. The ASPCA classifies lavender as toxic to dogs, cats, and horses. That said, the level of danger depends heavily on the form of lavender and how much your dog is exposed to. A quick sniff of a lavender bush in the garden is very different from chewing on the plant or ingesting concentrated lavender essential oil.
What Makes Lavender Harmful to Dogs
Lavender contains two compounds called linalool and linalyl acetate. These are the same chemicals responsible for lavender’s distinctive scent and its calming reputation in human aromatherapy. In dogs, these compounds are processed by the liver through a family of enzymes. Research published in Pharmaceuticals found that linalool and linalyl acetate bind strongly to three specific liver enzymes in dogs, meaning the liver has to work to break them down and clear them from the body.
The problem is that dogs metabolize these compounds differently than humans do. When a dog ingests a large enough quantity, the liver can struggle to process it efficiently, leading to a buildup that causes symptoms. Linalyl acetate binds particularly tightly to one of these liver enzymes, which can slow down the breakdown process further. Essential oils are far more concentrated than the fresh plant, so they pose a significantly greater risk.
Fresh Plant vs. Essential Oil
The fresh lavender plant contains relatively low concentrations of linalool and linalyl acetate. A dog that nibbles a few leaves or flowers from a garden plant will typically experience mild stomach upset at most. Many dogs that brush past lavender bushes or sniff them briefly have no reaction at all.
Lavender essential oil is a different story. Essential oils are highly concentrated extracts, containing far more linalool and linalyl acetate per drop than an entire sprig of fresh lavender. Even a small amount of undiluted essential oil, whether ingested, spilled on skin, or licked off fur, can cause a more serious reaction. Products like room sprays, massage oils, and potpourri that contain lavender essential oil also carry risk if your dog chews on them or laps up a spill.
Symptoms of Lavender Exposure
The signs your dog shows will depend on the amount and form of lavender involved. After eating part of the plant, you might notice:
- Nausea and vomiting
- Loss of appetite
- Diarrhea or soft stool
With essential oil exposure, symptoms can be more pronounced and may include:
- Drooling
- Vomiting
- Lethargy or unusual drowsiness
- Difficulty walking or unsteadiness
- Skin irritation or redness (if the oil contacts skin directly)
Dogs that ingest a significant amount of essential oil may show signs of liver stress, since that’s where the compounds are metabolized. Small dogs are at higher risk simply because it takes less to overwhelm their system.
Are Lavender Diffusers Safe Around Dogs?
Diffusing lavender essential oil is generally considered the lowest-risk form of exposure. When a diffuser disperses oil into the air, the concentration your dog inhales is much lower than what they’d get from direct contact or ingestion. The American College of Healthcare Sciences describes inhalation as one of the safest methods of essential oil use around pets.
There are still a few precautions worth taking. Keep the room well ventilated, and make sure your dog can leave the area freely if the scent bothers them. Dogs have a sense of smell roughly 10,000 to 100,000 times more sensitive than yours, so what smells pleasant to you can be overwhelming for them. Avoid diffusing near a dog’s crate, bed, or food bowl where they can’t easily escape the scent. Reed diffusers and plug-in air fresheners also pose an ingestion risk if a dog chews on or knocks them over.
Dogs with existing respiratory issues, like brachycephalic breeds (bulldogs, pugs, Boston terriers) or dogs with asthma, may be more sensitive to any aerosolized essential oil.
What to Do if Your Dog Eats Lavender
If your dog nibbles a small amount of fresh lavender from the garden, watch for vomiting or diarrhea over the next few hours. Most dogs recover on their own from minor plant ingestion without any intervention.
If your dog ingests lavender essential oil, the situation is more urgent. Try to determine roughly how much they consumed and whether the product was diluted or pure. Remove any remaining oil from their mouth or fur with mild soap and water to prevent them from licking more off themselves. Contact your veterinarian or the ASPCA Animal Poison Control Center (888-426-4435) for guidance specific to your dog’s size and the amount consumed. Do not try to induce vomiting unless a veterinarian specifically tells you to, since essential oils can cause additional irritation on the way back up.
Keeping a Lavender Garden With Dogs
You don’t necessarily need to rip lavender out of your yard. Most dogs ignore lavender plants entirely because the strong scent is unappealing to them. If your dog is a known plant-chewer, consider placing lavender in raised beds, behind low fencing, or in areas your dog doesn’t access unsupervised. The real danger comes from concentrated forms, so store essential oils, scented products, and potpourri well out of reach.
If you use lavender-based flea or calming products marketed for dogs, check that they’re specifically formulated for canine use at safe dilution levels. Human-grade lavender products are not interchangeable with pet-safe versions.