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My cat licked a mouldy granola bar left out overnight — should I be worried?

Cats · Food safety

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

Short answer

Yes, you should be concerned. Mould can produce mycotoxins that are harmful to cats, and granola often contains raisins or chocolate which are toxic. Watch for vomiting, diarrhea, or lethargy over the next day. If you see any of these signs, contact your vet promptly.

Granola — Food safety facts

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

Raisins, chocolate chips, nuts and sugar all show up in granola. Usually a no.

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

Granola is not poisonous to cats, 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

Theobromine is the part that hurts. Pets clear it far more slowly than people do, so it builds up and reaches the heart and nervous system.

Grapes and raisins are linked to kidney failure in dogs, and no safe amount is reliable — some pets react after only a few.

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

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

Open the full food page: Granola food facts →