Why Essential Oils and Cats Don’t Mix

There’s something to be said for an essential oil diffuser. The spa-like moment of water vapour and eucalyptus washing over you, briefly re-centring your frazzled nerves even if you haven’t moved from your sofa. Unfortunately, while essential oils are lovely for humans, it turns out they’re a lot less pleasant for animals – and you should probably stop using them at all around your cat.

For people, essential oils are just associated with pleasant smells (and dubious medical claims), but some oils can cause major problems with pets, especially cats. Cats lack an important enzyme in their liver, which makes it difficult for them to metabolise certain substances, such as essential oils, which can cause vomiting, trouble breathing and liver failure. According to the Pet Poison Hotline, the more concentrated the oil, the more dangerous it can be.

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Which essential oils are dangerous to cats?

The oils that the Pet Poison Hotline cites as hazardous to cats are: 

• cinnamon

• citrus (d-limonene)

• clove

• eucalyptus

• pennyroyal

• peppermint

• pine

• sweet birch

• tea tree

• wintergreen

• ylang ylang

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If you are a multi-pet household, the Pet Poison Helpline have shorter lists of dangerous or simply ‘bad’ substances for dogs:

• pennyroyal

• pine

• tea tree

• wintergreen

• cinnamon

• citrus

• peppermint

• sweet birch

• ylang ylang

Active vs passive diffusers

Part of the reason for the danger that lies in the different types of diffusers and the rise of ‘active diffusers’ – the plug-in ones that spritz nice smelling mist. Nebulising and ultrasonic diffusers send tiny droplets of both water and oil into the air – which smell really nice to us but can land on a cat’s fur, where they can absorb it through their skin or ingest it while grooming.

The older type of diffuser – the so-called ‘passive diffuser’ such as reed diffusers or heated plug-ins – still cause some worry, as the danger to cats can come via either inhalation or ingestion. Watch for signs of troubled breathing (panting, wheezing, etc), watering eyes or nose or vomiting, and get your pet to fresh air if any of these happen (and to a vet if they don’t get better quickly). Even if your cat isn’t showing any issues with breathing, watch out for them getting too close to a diffuser and deciding to chew on the ends of the reeds – there’s a famous quote about curiosity and cats for a reason.

With active diffusers, the oil can still be breathed in, ingested through grooming, or absorbed through the skin. The exact symptoms can vary by type of oil and amount ingested but include dribbling, vomiting, tremors, wobbliness (ataxia), trouble breathing, low heart rate and even liver failure. Small cats, kittens and those with pre-existing conditions can be more at risk than others. These are severe, and even potentially life threatening, conditions.

Don’t use essential oils for parasite control

If you’re researching how to manage ticks and fleas for your pets, it’s not rare to find people recommending essential oils, often some of the ones we’ve mentioned above – notably eucalyptus, mint, tea tree and citrus. While there may be some preliminary scientific research pointing to those compounds as potentially effective at repelling some insects, those studies are almost always lab tests for overall efficacy and not done in conjunction with safety testing for the pets they’d be applied to.

Sometimes you’ll find that these lists are specifically aimed at dog owners recommending oils that are less dangerous for them. Even so, be careful – and if you own both cats and dogs, don’t use those oils, as your cat might decide that it’s time to groom your Husky and get a mouthful of something deadly.

Always consult your vet when you’re looking to treat a pet health problem like ticks and fleas, as they’ll have a better idea of what’s appropriate for your pet, budget and situation. All of the main pest control medications have to go through extensive testing and certification before they hit the market.

What can I use in place of a diffuser?

Passive diffusers are, on the whole, significantly safer than active ones. They may not give you a lovely face full of mist in your home office, but they’re much less likely to cause problems with your pets, especially if you stick to oils that are nowhere on the danger list (and keep the diffusers well out of the reach of curious animals).

The same rules apply to scented candles. Always keep an eye on your cats and make sure they’re not showing any adverse reactions. There are some candles designed specifically to be pet friendly, but we haven’t tried them, so we can’t speak to how they actually smell.

My personal suggestion? Bake some biscuits. Because then your house smells amazing, your cat stays safe, and you get to have biscuits.