Olive Oil for Cats: Is It Safe, How Much, and When to Skip It
Olive oil for cats usually comes up in one of three ways: a cat that keeps bringing up hairballs, a cat that seems constipated, or a cat that watches you pour oil over your supper and plainly wants a taste. Plain olive oil is not on any list of foods poisonous to cats, and a little is unlikely to harm a healthy adult. But cats are obligate carnivores, the feline evidence for any benefit is close to nil, some popular online doses would add more than half a day's resting calories in one go, and several of the problems people reach for oil to fix need a vet rather than the kitchen cupboard. This guide sets out what veterinary sources and the published research actually say, how much fits a cat's calorie budget, and when to skip it.
For our own oil — made for people's kitchens, not as a pet product — see our Cold-Pressed Single-Estate Extra Virgin Olive Oil - Marrakech (500ml).
The Short Answer
- Plain olive oil is not toxic to cats, and cats digest it well: in a small University of Nottingham feeding study (Peachey and colleagues, 1999), cats absorbed almost all the monounsaturated fat from an olive-oil-enriched diet. That shows it is digestible, not that it does a cat any good.
- Olive oil is pure fat, at about 40 kcal per teaspoon (USDA). A 4 kg cat's resting energy need is roughly 200 kcal a day, so one teaspoon is about a fifth of it — and the tablespoon some websites suggest is around 60%.
- Cornell Feline Health Center advises keeping treats to no more than 10–15% of a cat's daily calories. For a typical 4 kg cat, about half a teaspoon of oil uses up the whole of a 10% allowance on its own.
- Olive oil is not an established remedy for hairballs, constipation or ear mites. Each has a vet-recognised approach that works better, and some of the signs behind them need a vet promptly.
- Never syringe or force oil into a cat's mouth: oil that is inhaled can cause lipid pneumonia, a complication documented in cats given oil by force.
- Sidr & Stone makes a single-estate, cold-pressed extra virgin olive oil for people. We make no health claims for cats; if your vet is happy for your cat to have a little, plain extra virgin olive oil is the sensible kind.
Is Olive Oil Safe for Cats? What the Evidence Actually Covers
Olive oil does not appear on the ASPCA's list of people foods to avoid feeding pets, and veterinary references do not treat plain olive oil as a poison for cats. "Not harmful in a small amount" is a different claim from "good for them", though, and that is where the evidence runs out.
Start with the cat itself. Cornell Feline Health Center describes cats as obligate carnivores, which "rely on nutrients found only in animal products". A complete commercial cat food is formulated to supply the fat and essential fatty acids a cat needs, so oil spooned on top is not filling a known gap — it is adding calories.
The one study that has put olive oil into cats' diets measured digestion, not health. Peachey, Dawson and Harper, writing in Growth, Development and Aging in 1999, fed six young and six senior cats diets enriched with beef tallow, sunflower oil or olive oil in a crossover design [1]. The cats absorbed the monounsaturated fat — the main fat in olive oil — almost completely (about 98% in the young cats and 96% in the seniors), and the older cats digested every type of fat slightly less well. It is a twelve-cat laboratory study using research diets, so it tells us olive oil is a fat cats absorb readily — which is exactly why its calories count — not that a drizzle on their food improves anything.
The large body of research on olive oil and health has been carried out in people, mostly within the Mediterranean diet — see our overview of olive oil polyphenols — and cannot simply be transferred to a cat. Our position for cats is plain: we make no health claim, and the evidence would not support one.
How Much Olive Oil Can a Cat Have? Count the Calories
How much olive oil can a cat have? There is no veterinary dose, so the most useful limit is a calorie one. Cornell Feline Health Center advises that treats should not exceed 10–15% of a cat's daily calories. At about 40 kcal per teaspoon, olive oil uses up a 10% allowance in roughly half a teaspoon for an average-sized 4 kg cat.
The table uses the standard resting energy requirement formula, 70 × body weight in kg0.75, as a deliberately cautious baseline; it is the starting point veterinary nutrition teams use for calorie calculations. A cat's real needs vary with age, neutering and activity, so treat these figures as a guide to scale — your vet can work out your own cat's number.
| Cat's weight | Resting energy (approx. kcal/day) | 10% of that | Olive oil equivalent (at ~40 kcal/tsp) | One tablespoon (~119 kcal) as a share of resting energy |
|---|---|---|---|---|
| 3 kg | ~160 | ~16 kcal | a little under ½ teaspoon | ~75% |
| 4 kg | ~200 | ~20 kcal | about ½ teaspoon | ~60% |
| 5 kg | ~235 | ~23 kcal | a little over ½ teaspoon | ~50% |
| 6 kg | ~270 | ~27 kcal | about ⅔ teaspoon | ~45% |
Those are ceilings for every extra combined — treats, titbits, the lick of butter — not targets for oil. The quarter-teaspoon a day suggested by several olive oil and pet-care sites is about 10 kcal, or roughly 5% of a 4 kg cat's resting needs; the tablespoon suggested elsewhere is in a different league altogether. Weight matters here: in the Association for Pet Obesity Prevention's 2022 US survey, 61% of cats were classified as overweight or obese, and Cornell calls obesity the most common nutrition-related problem in cats. For the full numbers, see our breakdown of olive oil calories.
If your vet agrees to a little, start with a few drops mixed into food rather than given neat, and watch the litter tray for a few days before deciding whether it suits your cat at all.
Hairballs, Constipation and Ear Mites: What Vets Actually Recommend
These are the three reasons most people search for olive oil for cats, and in each case the veterinary route looks rather different from the home-remedy advice.
Hairballs
Cornell Feline Health Center says it is normal for a cat to bring up a hairball "once every week or two". Its standard advice is regular brushing — and professional grooming for long-haired cats — plus a commercial hairball remedy, usually a mild petroleum-based laxative, given once or twice a week. Olive oil is not part of that advice, and no feline study shows it prevents hairballs. Cornell is clear about where home care stops: a cat that is lethargic and off its food for more than a day or so, or keeps retching without bringing anything up, needs a vet promptly, because those signs can point to a blockage.
Constipation
Constipation in cats has many causes — swallowed fur, obstruction by foreign bodies, strictures or tumours — and Cornell advises treating it "fairly aggressively to prevent progression". Veterinary management centres on hydration, fibre, prescribed laxatives and, where needed, drugs that improve gut movement. Our article on olive oil for constipation looks at the human trials; none of them involved cats. Before assuming constipation at all, rule out the bigger risk: a cat straining in the litter tray may be unable to pass urine, and the University of Illinois College of Veterinary Medicine calls urethral obstruction "a true emergency".
Ear mites
Some sites suggest olive oil drops for ear mites. Cornell does note that an old-time remedy — baby oil, a few drops several times a day for a month or so — will usually smother the mites, but its advice starts with a diagnosis: a vet confirms mites with an otoscope or under a microscope, then cleans the ears so modern topical treatments, which are highly effective, can work. That diagnosis matters because mites are only one cause of feline ear inflammation; an overgrowth of Malassezia yeast is another, and oil will not fix it.
The Real Risks: Calories, Upset Stomachs, Aspiration and Infused Oils
The commonest problem with added fat is digestive: too much, or a sudden change, can bring on loose stools or vomiting. Weight gain is the slower risk, for the calorie reasons above.
Pancreatitis deserves an honest word, because cats differ from dogs here. VCA Animal Hospitals' veterinary guidance states that, unlike dogs, cats do not appear to develop pancreatitis as the result of eating a high-fat diet — though some vets still prefer to avoid excessive fat during treatment. That is not a licence to add oil for a cat recovering from pancreatitis or another digestive illness: the vet's diet plan comes first.
Never syringe or force oil into a cat's mouth. Oil forced into the mouth can be inhaled, and inhaled oil can cause lipid pneumonia. Mallol and colleagues, in JFMS Open Reports in 2019, described three constipated cats that developed chronic exogenous lipid pneumonia after long-term forced oral dosing with mineral oil [2]. Their cases involved mineral oil, not olive oil, but the lesson about forcing any oil into a cat applies to both.
Finally, the oil in your kitchen is not always plain. The Merck Veterinary Manual describes cats as the species most susceptible to garlic and onion (Allium) poisoning, with toxicosis reported after less than a teaspoon of cooked onion. Garlic- or onion-infused oils, dressings and pan juices are off the table, and so are oils with essential oils added: Hill's Pet Nutrition, citing the Canadian Veterinary Medical Association, lists lavender, peppermint, tea tree and many others as toxic to cats. Our guide to infused olive oil explains what goes into those bottles.
When to Skip Olive Oil Entirely
For some cats the sensible answer is simply "not without your vet". Skip added olive oil, or ask first, if your cat:
- is overweight, or on a weight-loss plan
- has had pancreatitis, inflammatory bowel disease or another chronic digestive condition, or eats a prescription diet
- vomits hairballs more often than once every week or two, or has recurring vomiting, diarrhoea or constipation — signs worth a vet check in their own right
- is a kitten on a complete kitten food, or is pregnant or nursing
- has diabetes, kidney disease or another medical condition, or takes regular medication
- already gets loose stools from rich food or treats
And do not rub olive oil into a cat's coat or paws. Cats groom meticulously, so whatever goes on the fur ends up swallowed as an unmeasured dose — and a dull or greasy coat is itself a sign worth showing your vet.
If Your Vet Says Yes: Choosing the Right Olive Oil
If your vet is comfortable with a small amount, choose the plainest option: extra virgin olive oil with a single ingredient and nothing added. Avoid flavoured and infused oils, spray oils with propellants, and anything that has been used for cooking. Olive oil also goes stale, so it is worth knowing how to tell when olive oil has gone off.
For a fuller walkthrough of what separates a well-made bottle from a tired one, see our guide to choosing a quality olive oil. If you have a dog as well, our sister article on olive oil for dogs takes the same vet-first approach — with one notable difference, since the fat-and-pancreatitis question plays out differently in dogs.
Why Sidr & Stone
Sidr & Stone's olive oil is made and sold as food for people, not as a cat product, and we make no claims about what it does for animals. What we can stand behind is how the oil is made — the things worth checking in any extra virgin olive oil, whoever ends up eating it.
- Single-estate: Sidr & Stone's olive oil comes from our own family-owned farm on the plains outside Marrakech, Morocco, and we control every step from tree to bottle, with no blending across origins.
- Rain-fed: our trees are not irrigated; they take what the season gives.
- Organically grown: no synthetic fertilisers, pesticides or herbicides are used on Sidr & Stone's farm (not yet certified organic; certification is in progress).
- Single harvest: a small, limited single-harvest batch, picked when the fruit is ready; the current batch's harvest details are on the product page.
- Cold-pressed within hours of harvest: mechanical extraction only, to preserve flavour, aroma and polyphenols.
- Unfiltered extra virgin: minimally processed, so a little natural sediment in the bottle is normal.
- 100% natural: a single ingredient — olive oil — with nothing added.
- Dark glass with a gold label: a 500ml bottle that protects the oil from light.
- 10% of profits to charity, as with every Sidr & Stone product.
- Fulfilment in the UK, EU, and US.
We will not tell you Sidr & Stone is the best olive oil — that would be the kind of claim this article warns against. What we will say is that our oil is single-estate Moroccan, rain-fed, organically grown and cold-pressed within hours of harvest, and that the care shows in the taste, the colour and the small single-harvest batch.
Frequently Asked Questions
Is olive oil good for cats?
Plain olive oil is not toxic and cats digest it well, but there is no good evidence that it benefits them. Cats are obligate carnivores and a complete cat food already supplies the fat they need, so treat oil as an occasional extra at most — and check with your vet first.
Can olive oil help with cat hairballs?
There is no feline study showing it does. Cornell Feline Health Center recommends regular brushing and a commercial hairball remedy instead, and advises a vet visit for a cat that keeps retching without producing a hairball or stops eating.
How much olive oil can I give my cat?
There is no veterinary dose, so ask your vet. As a calorie guide, half a teaspoon of olive oil (about 20 kcal) uses up the whole 10% treat allowance of a typical 4 kg cat, so any amount should be small, mixed into food and counted within treats.
Can I give my cat olive oil for constipation?
Speak to your vet instead. Feline constipation can progress and has several possible causes, and a cat straining in the litter tray may actually be unable to urinate — an emergency, particularly in male cats.
Is extra virgin olive oil better for cats than other olive oils?
If your vet is happy for your cat to have a little, plain extra virgin olive oil is the simplest choice: one ingredient, unrefined. Avoid infused, flavoured or cooking-pan oils, which may contain garlic, onion or essential oils that are toxic to cats.
Can I put olive oil in my cat's ears for ear mites?
Not before a vet has examined the ear. Mites are only one cause of ear trouble in cats, and modern prescription treatments are highly effective once mites are confirmed.
Where can I buy a good extra virgin olive oil?
Look for a single-origin, cold-pressed extra virgin oil in dark glass with a clear harvest or best-before date. Our Cold-Pressed Single-Estate Extra Virgin Olive Oil - Marrakech (500ml) is available to pre-order, with fulfilment in the UK, EU, and US.
Is olive oil a medicine?
No. Olive oil is a food, not a medicine. It has a long traditional history — including being honoured in the Prophetic Sunnah — and a substantial body of modern research, particularly around polyphenols, cardiovascular health, and the Mediterranean diet pattern. It can be a worthwhile part of a healthy routine, but it does not cure diseases and is not a substitute for medical care. Be cautious of any olive oil marketed with specific disease-cure claims.
Final Thoughts
Olive oil for cats is neither the cure-all some pet blogs describe nor a hidden poison. Plain olive oil is a digestible, non-toxic fat, and a few drops on a healthy cat's dinner are unlikely to do harm. But cats are obligate carnivores with small calorie budgets, the direct feline evidence for benefit is close to nil, and the problems people most often use oil for — hairballs, constipation, itchy ears — each have a better, vet-led answer.
So keep it plain, keep it tiny, count it inside the treat allowance, never force it, and keep the garlic oil well out of reach.
Our Cold-Pressed Single-Estate Extra Virgin Olive Oil - Marrakech (500ml) — single-estate, rain-fed and cold-pressed within hours of harvest — is made for your own kitchen and is available to pre-order from our limited single-harvest batch, with fulfilment in the UK, EU, and US.
Our extra virgin olive oil is grown organically on our own single-estate farm on the plains outside Marrakech: we control every step from tree to bottle, and no synthetic pesticides, herbicides or fertilisers are used. It is not yet certified organic — certification is in progress, and we will publish it as soon as it comes through.
References
- Peachey SE, Dawson JM, Harper EJ. The effect of ageing on nutrient digestibility by cats fed beef tallow-, sunflower oil- or olive oil-enriched diets. Growth Dev Aging. 1999;63(1-2):61–70. PMID 10885858.
- Mallol C, Espada Y, Lloret A, Altuzarra R, Anselmi C, Novellas R. Dystrophic mineralisation in chronic exogenous lipid pneumonia in cats. JFMS Open Rep. 2019;5(1):2055116919850255. PMID 31205738. doi:10.1177/2055116919850255
Disclaimer: This article summarises published veterinary research and general guidance on olive oil and cats at the time of writing; research findings and guidance may change, and readers should check current sources. Sidr & Stone olive oil is made and sold as food for people, not as a veterinary product, and nothing here is veterinary advice — before adding any food or oil to your cat's diet, or if your cat is unwell, consult a qualified veterinary professional. References to Cornell Feline Health Center, the ASPCA, VCA Animal Hospitals, the Merck Veterinary Manual, Hill's Pet Nutrition, the University of Illinois and the Association for Pet Obesity Prevention describe their published guidance and imply no affiliation or endorsement. Olive oil is a food, not a medicine, and is not a substitute for medical treatment of any condition. For any health concern of your own, consult a qualified medical professional.