Cloves are not safe for dogs. The spice contains a compound called eugenol, which makes up roughly 80–90% of clove oil and is toxic to dogs even in small amounts. Whether your dog grabbed a whole clove off the counter, licked clove oil, or got into a product containing clove essential oil, the risk is real and worth taking seriously.
Why Cloves Are Toxic to Dogs
Eugenol is the chemical that gives cloves their strong, warm smell. In humans, it’s used in dental products and cooking without much issue. Dogs, however, process compounds through the liver differently. When a dog absorbs eugenol, whether by eating it or through the skin, the liver struggles to break it down safely.
Animal studies show that eugenol causes direct liver damage, including abnormal enlargement of liver cells and cell death. In one study, 100% of animals in the highest-dose group showed significant liver cell changes, and 40% had liver cells actively dying. The lungs and kidneys also showed inflammatory damage, with higher doses producing worse inflammation. Notably, when researchers compared eugenol to another plant compound tested alongside it, eugenol appeared to be the primary driver of organ damage.
Symptoms of Clove Poisoning
The most common signs of clove or clove oil poisoning in dogs are vomiting, drooling, lethargy, loss of coordination, and refusal to eat. These can appear within minutes to hours of exposure, depending on the amount and form (whole cloves versus concentrated oil).
In more serious cases, dogs may develop tremors, seizures, low body temperature, a dangerously slow heart rate, or rear-limb paralysis. Clove oil can also cause ulcers in the stomach and intestines. At its worst, clove toxicity leads to liver failure or kidney failure, both of which can be fatal without prompt treatment.
Clove Oil Is More Dangerous Than Whole Cloves
A single whole clove that falls on the floor is less concentrated than a bottle of clove essential oil, but neither is truly safe. Essential oils are highly concentrated plant extracts, so even a small spill of clove oil delivers a much larger dose of eugenol than a single dried clove would. The American Kennel Club notes that essential oil compounds are rapidly absorbed into a dog’s system, whether swallowed or absorbed through the skin, and then processed by the liver.
This matters because clove oil sometimes shows up in “natural” flea and tick products. A retrospective veterinary study covering 2006 to 2008 found that plant-based flea products containing essential oil mixtures, including clove oil at concentrations of 1.7–5%, caused adverse effects in dogs such as lethargy and vomiting. Even at a 16% concentration applied to the skin in a controlled test, nearly 30% of dogs showed allergic reactions like scratching, itching, and rubbing against furniture within 15 minutes.
Skin Contact Carries Risk Too
You might assume that keeping clove oil off your dog’s tongue is enough, but skin exposure is also a problem. Undiluted essential oils irritate a dog’s skin on contact, and the compounds pass through the skin into the bloodstream. Once absorbed, they reach the liver just as they would after ingestion. There’s also a secondary risk: dogs frequently lick irritated skin, which means topical exposure can easily become oral exposure too. If clove oil gets on your dog’s fur or skin, wash it off immediately with liquid dish soap.
What to Do If Your Dog Eats Cloves
Do not try to make your dog vomit, and do not give activated charcoal. Both of these common home remedies can actually worsen the situation with essential oil poisoning. Instead, remove any remaining cloves or clove oil from your dog’s reach, save the packaging or container so the vet can see exactly what your dog was exposed to, and contact your veterinarian or an animal poison control hotline right away.
At the clinic, your vet will likely run bloodwork to check whether the liver and kidneys have been affected. Treatment focuses on managing whatever symptoms have appeared, including IV fluids, anti-nausea medication, and organ support as needed. The faster a dog gets veterinary care, the better the outcome. Dogs treated early and aggressively for essential oil poisoning generally recover, but delayed treatment raises the risk of lasting organ damage.
Common Sources of Clove Exposure
Dogs don’t usually seek out cloves on their own, but accidental exposure happens more often than you’d expect. Common culprits include:
- Holiday cooking and baking: Whole cloves in ham, mulled wine, or pumpkin pie spice blends left on counters
- Essential oil diffusers: Clove oil mist settles on surfaces dogs lick and enters their airways
- Natural flea or tick sprays: Some contain clove oil as an active ingredient
- Potpourri: Liquid potpourri containing clove oil is particularly hazardous
- Clove cigarettes or clove-scented products: Contain enough eugenol to cause problems if chewed
If you use a diffuser with clove oil in your home, keep the room well ventilated, place the diffuser where your dog cannot reach it, and watch for signs like coughing, sneezing, or watery eyes that suggest your dog is reacting to the airborne oil. For flea and tick prevention, conventional veterinary products have a much stronger safety profile than essential oil alternatives.