✓ Reviewed against PDSA, Blue Cross & Animal PoisonLine guidance · Last reviewed: 2026-07
Can dogs eat blue cheese?
The full picture
Blue cheeses are made using Penicillium roqueforti mould, which produces a compound called roquefortine C. Dogs are unusually sensitive to this compound — far more than humans — and exposure can cause vomiting, diarrhoea, high temperature, muscle tremors, and in worse cases seizures that can last for up to two days. Vets report increased cases around Christmas when Stilton appears on cheese boards. All blue cheeses carry this risk: Stilton, Roquefort, Gorgonzola, Danish blue, Cambozola. A small lick usually isn't an emergency, but larger amounts or smaller dogs warrant a vet call. Unlike most dairy issues (which are just lactose intolerance), this is a specific toxicity.
If your dog has already eaten blue cheese
Call your vet if your dog has eaten blue cheese. The Penicillium mould that creates the blue veining produces roquefortine C, which can cause vomiting, diarrhoea, tremors, and seizures in dogs.
Risks to watch for
- Vomiting and diarrhoea
- Elevated body temperature
- Muscle tremors
- Seizures in severe cases
- Pancreatitis from the high fat content
- Effects can last up to 48 hours
Safe portion size
None. Skip blue cheese entirely.
Safer alternatives
- Small amount of plain cheddar
- Cottage cheese
While you're checking what your dog can safely eat, make sure their flea and worm protection is up to date too.