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My 25 kg dog ate half a 200g block of cheddar cheese — is that amount likely to cause pancreatitis or just diarrhoea?

Dogs · Food safety

Last reviewed: 2026-09-05 · Reference ranges: ASPCA, Pet Poison Helpline & Merck Veterinary Manual

Short answer

That much cheese is likely to cause diarrhoea or vomiting, not immediate pancreatitis. The fat and lactose in half a block can overwhelm a dog's system, leading to significant gastrointestinal upset within a few hours. Pancreatitis is a risk with large fatty meals, but one episode like this is more often a messy clean-up than a medical emergency. Withhold food for 12 hours, provide water, and watch for severe vomiting, a hunched back, or obvious pain. Call your vet if those signs appear.

Cheese — Food safety facts

Feed with care · Dogs · full breakdown on the linked food page

Most pets are lactose-intolerant to some degree. Tiny pieces are fine as treats; avoid if your pet gets diarrhoea.

Dogs and cats carry the same rating (Feed with care), so the notes below hold for either pet.

Cheese is not poisonous to dogs, but it is easy to over-feed. Rich fat, salt or seasoning can bring on vomiting or diarrhoea within a day, and repeated large portions are a recognised trigger for pancreatitis.

If it ate some before you noticed, watch for vomiting, diarrhoea, loss of appetite, unusual tiredness or a painful, swollen abdomen over the next 24 hours. A one-off small amount in a healthy adult usually passes with water and rest; repeated exposure, a puppy or kitten, a senior, or a pet with an ongoing illness is a reason to call your vet the same day.

Why these cautions matter

Added sugar brings empty calories, and over months that means weight gain and dental disease — both far harder to undo than to avoid.

Most adult pets make very little lactase, so dairy tends to produce gas, bloating and diarrhoea instead of usable nutrition.

Cheese can turn up now and then, but not as a daily habit: keep the rest of the day's food unchanged and watch the next walk and the stool that comes with it.

The full verdict, portion guidance and serving notes are collected on the Cheese food facts page.

Open the full food page: Cheese food facts →