Can dogs eat sweet potato?

Why

Sweet potato is not toxic to dogs. It is a plain starchy root vegetable, and you will find it listed on the back of a great many complete dog foods. Cooked and served plain, most dogs eat it happily and digest it without any fuss at all. It carries useful fibre, beta-carotene, vitamin C and potassium — though a dog eating a decent complete food is not short of any of those, so think of sweet potato as a treat your dog enjoys rather than something they need.

Raw is the one firm exception. Uncooked sweet potato is dense and hard, and its starch is in a form a dog's gut struggles to break down, so it tends to come back as wind and a loose, unhappy tummy. Worse, a hard raw chunk is a genuine choking risk and can lodge in the gut of a small dog or an enthusiastic gulper who swallows first and thinks later. Cooking softens the flesh and makes the starch digestible, which is the whole point. Sweet potato is also not the same plant as an ordinary potato — that one has its own problem with solanine when raw or green — but the answer for both is the same: cook it.

In practice, the thing that lands dogs at the vet is almost never the sweet potato itself — it is what we put on it. Butter, oil, salt, sugar, syrup and marshmallow all turn a harmless vegetable into a bad idea, and a fatty, greasy helping can tip a susceptible dog into pancreatitis. More seriously, roast and mashed sweet potato is often cooked with onion or garlic powder, both of which are properly toxic to dogs, and festive versions can contain nutmeg or a sweetener such as xylitol. Plain means plain: cooked in nothing, with nothing stirred through it.

The last thing to keep in mind is simply that sweet potato is starchy and calorie-dense, so it adds up faster than a vegetable feels like it should. The usual vet guideline is that treats of any kind should stay under about 10% of your dog's daily calories, and sweet potato counts towards that. This is a calorie question rather than a vitamin one — the beta-carotene that gives sweet potato its colour is a building block the body converts into vitamin A only as it needs it, so it does not stack up the way vitamin A from sources such as liver or fish liver oils can. Keep the portions small because of the calories, not because there is anything sinister in the vegetable. If your dog is diabetic, overweight, or has had pancreatitis, check with your own vet before making it a regular thing — starch and blood sugar are their department, not the internet's.

How much is sensible?

Small and occasional is the whole of it: think a couple of small cubes or a spoonful of mash for a Labrador, and one small cube or a teaspoon for a terrier or a Chihuahua — alongside their normal food, not instead of it, and well inside that 10%-of-daily-calories treat allowance. Peel it, cut it up, then steam, boil or bake it until it is properly soft, with nothing added at all — no butter, oil, salt, sugar, honey or stock. Peeling is about comfort and digestion rather than safety — the skin is not poisonous, it is simply tough, fibrous work for a dog's gut — but it takes ten seconds and gets rid of any grit from the outside, so make a habit of it. Let it cool completely before it goes anywhere near your dog, and mash it or cut it small for little mouths and fast eaters. If it is their first time, offer a scrap and see how the next day's tummy goes before you offer more; some dogs are simply windier on it than others.

Signs to watch for

• Wind — usually the first sign there has been a bit too much
• Soft or loose stools, sometimes with an orange tinge to them, a day or so later
• A gurgling, unsettled tummy, or less enthusiasm for the next meal
• Being sick, if they have had a big helping or something greasy or seasoned with it
• Creeping weight gain, if sweet potato becomes a regular daily extra
• Repeated vomiting, straining, a tense or painful belly, or a dog gone very flat after swallowing a raw chunk — this one is not a wait-and-see

If your dog has had too much

If your dog has simply helped themselves to rather a lot of plain cooked sweet potato, this is usually a windy evening and a soft stool or two rather than an emergency: skip any further treats, keep fresh water down, feed their normal meals as usual, and let it settle over a day. Ring your vet, though, if they are being sick repeatedly, cannot keep water down, are straining without producing anything, have a tense or painful tummy, or have gone unusually quiet and flat — and do not wait to see if it passes, particularly in a small dog or a puppy who has bolted a raw chunk whole. Ring them too if what your dog ate was seasoned or sweetened rather than plain, especially anything cooked with onion or garlic powder, nutmeg, or a sugar-free sweetener, and be ready to say roughly how much they had and when. If your dog is diabetic, prone to pancreatitis, or on medication, a quick call for advice is always the right move — your vet knows your dog and we don't. And don't try to make your dog sick unless a vet specifically tells you to.

Serving tips

• Cook it plain — steam, boil or bake until soft, with nothing in the pan and nothing stirred in afterwards. Never raw, and never lifted out of the roasting tin, which is full of oil, salt and often garlic.
• Peel it every time. The skin is not harmful, but it is tough fibre and harder work to chew and digest than the flesh, and peeling takes the outside grit off with it.
• Let it cool right through and size it to the dog: mash for small breeds and gulpers, small cubes for bigger dogs. Nothing should be big enough to swallow whole.
• Batch cook, mash and freeze it in an ice-cube tray. One cube pressed into a hollow rubber toy is a slow, cooling treat — and freezing in portions stops a spoonful quietly turning into half a bowl.

Common questions