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A dog that steals one or two crisps is very unlikely to come to harm. They are not poisonous. But they are a poor thing to hand over on purpose, and the reason is partly the salt and fat and partly what is in the flavouring.
The short answer
A crisp is potato, oil and seasoning. None of that is inherently toxic to a dog. The problem is that all three are wrong for one in any quantity, and the seasoning can be worse than wrong.
The seasoning is the part that matters
Onion and garlic powder appear in most savoury crisp flavourings — cheese and onion, sour cream and onion, barbecue, chilli. Both are genuinely toxic to dogs: they damage red blood cells, and the effect is cumulative, so small amounts repeated over days matter more than one mouthful.
Powdered forms are more concentrated than fresh, which is exactly why seasoning deserves attention. The earlier version of this article discussed salt and fat and never mentioned onion at all.
The signs are slow — often days — and include weakness, pale gums, breathlessness and dark or reddish urine. Those need a vet, and it is easy to miss the connection because of the delay.
Salt and fat
Crisps are salty and fried. A large salt load causes excessive thirst and vomiting; a sudden fatty snack is one of the recognised triggers for pancreatitis. A small dog reaches both thresholds on a much smaller portion than a large one.
My dog ate a bag — what now?
- A crisp or two, medium or large dog: almost certainly fine. Make sure water is available.
- A small dog, or a good handful: ring your vet for advice, with the packet so you can read the ingredients.
- Most of a bag: phone your vet. Salt, fat and seasoning all scale badly.
- Weakness, pale gums, breathlessness or dark urine, even days later: phone your vet and mention the crisps.
- Repeated vomiting, a hunched back or a swollen belly: phone your vet now.
Better things to share
- Carrot sticks, cucumber, green beans or a little plain pumpkin
- Apple without the core or pips, banana, blueberries
- Plain air-popped popcorn, unsalted and unbuttered, if it is the crunch they want
- Their own kibble, counted out of the daily ration and used as training rewards
A shop-bought dog biscuit is also a perfectly reasonable answer — made for the purpose, portioned for a dog, and without the seasoning problem.
This is general information, not veterinary advice, and it cannot account for your dog’s size, age or health. If your dog has eaten something you are unsure about, phone your vet rather than searching for reassurance.
