Household products
Is hand warmers toxic to cats and dogs?
Also sold as air-activated heat packs, oxygen absorbers, iron powder, foot warmers
Cats
ToxicDogs
ToxicSingle-use, air-activated hand warmers contain iron powder. A dog that chews one can get mouth irritation and, from larger amounts, iron poisoning. Reusable gel warmers are low risk.
By Maya HartIf your pet got into it
- Call your vet or a pet poison helpline now, even if your pet seems fine.
- Have the packet ready: the vet needs the name, strength and how much may be missing.
- Do not make your pet sick unless a vet tells you to.
- Bring the packaging, and note how many warmers are missing.
Signs to watch for
- Vomiting, possibly with blood
- Diarrhoea
- Belly pain
- Lethargy
- Signs may seem to improve, then liver damage appears 1–2 days later (large amounts)
How much is dangerous
Iron toxicity depends on the amount eaten and the dog’s weight; several warmers in a small dog is a concern.
Keeping it safe
- Throw used warmers in a closed bin
- Keep them out of coat pockets that dogs explore
- Watch for oxygen absorber sachets in food packets too
The details
Hand warmers are a winter cousin of the oxygen absorbers found in treat packets: both contain iron powder that reacts with air. Iron is corrosive to the stomach, and absorbed iron damages the liver. Many cases involve dogs raiding pockets after a winter walk or match.
Iron poisoning can follow a deceptive course, with early stomach signs settling before more serious problems appear, so vets often recommend blood tests even if your dog seems better.
Questions owners ask
Is hand warmers toxic to cats?
Yes — toxic.
Is hand warmers toxic to dogs?
Yes — toxic.
How much is dangerous?
Iron toxicity depends on the amount eaten and the dog’s weight; several warmers in a small dog is a concern.
What should I do if my pet got into it?
Call your vet or a pet poison helpline now, even if your pet seems fine. Have the packet ready: the vet needs the name, strength and how much may be missing. Do not make your pet sick unless a vet tells you to. Bring the packaging, and note how many warmers are missing.
Sources
Tailwise is for general information and is reviewed by veterinary professionals, but it is not a substitute for advice from your own vet, who knows your pet. How we check facts