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“Natural” bug sprays made with essential oils are often marketed as the gentle choice for families with pets. For dogs and people that’s often reasonable. Cats are a different story. Veterinary organizations warn that many essential oils can poison cats, and pest control products are a common source of exposure.
Why cats are different
Cats’ livers process certain compounds, including many found in essential oils, much less efficiently than dogs’ or people’s do, so those compounds can build up to toxic levels. Cats are also small, groom constantly, and lie on floors and furniture, so residue on fur, paws and fabric ends up in their mouths. PetMD notes that some essential-oil flea products labeled for cats can still cause poisoning even when used as directed.
Oils commonly flagged as toxic to cats
Lists vary slightly between sources, but veterinary groups including the PDSA, Cats Protection, Hill’s and PetMD repeatedly name:
- Tea tree (melaleuca), which is especially dangerous
- Peppermint and other mints
- Citrus oils (lemon, orange, lime, d-limonene)
- Clove and cinnamon
- Eucalyptus
- Lavender
- Pine
- Pennyroyal, wintergreen and sweet birch
- Ylang ylang, thyme and oregano
Many of these are exactly the ingredients in “natural” flea sprays, ant sprays and spider repellents.
Warning signs
- Drooling or pawing at the mouth
- Vomiting
- Wobbliness, weakness or tremors
- Trouble breathing, coughing or panting
- Redness or burns on the skin, lips or tongue
If you see these after an exposure, don’t wait. Wash any product off the fur with a mild dish soap if you can do it without stressing the cat, and call your vet.
Lower-risk bug control in a cat home
- Fleas: Use a vet-recommended flea product made for cats, and vacuum daily. Don’t use dog flea products on cats; many contain permethrin, which is highly toxic to cats.
- Ants: Enclosed borax bait stations placed where your cat can’t get to them, plus cleanup and sealing. See our ant guide.
- Roaches: Enclosed bait stations and sealing gaps, or boric acid dusted only inside wall voids and cracks the cat can’t reach. See our roach guide.
- Flying insects: Window screens, fans and sticky or light traps placed out of reach.
Check price for enclosed ant bait stations →
Check price for indoor plug-in insect traps →
What about diffusers and cleaners?
The same concern applies to essential oils in diffusers, candles and DIY cleaning sprays, especially in small, closed rooms. If you use them, keep them out of rooms your cat uses and never let your cat be stuck with no way out.
This article is general information, not veterinary advice. Talk to your veterinarian about your cat’s specific health and any products you plan to use.