Some coins, notably post-1982 U.S. pennies, are high in zinc. Once swallowed, stomach acid breaks the zinc down and it is absorbed into the bloodstream, where it destroys red blood cells and can damage the liver, kidneys, and heart. Pet Poison Helpline notes that swallowing a zinc-containing coin can be fatal without treatment.
Signs to watch for
Weakness, pale or yellowish gums, vomiting, rapid breathing, rapid heart rate, dark discolored urine, collapse
What to do next
Get an x-ray as soon as possible: the coin needs to be located and usually removed before it does more damage. Don't wait to see if it passes on its own.
A single zinc-containing coin can be dangerous regardless of your dog's size. This is about the object sitting in the stomach and continuously releasing zinc, not a per-pound dose.
Can I treat this at home?
No. This needs an x-ray and likely removal by endoscopy or surgery. It isn't a watch-and-wait situation.
When should I call the vet?
Immediately, any time you know or suspect your dog swallowed a coin.
Compiled from veterinary poison-control and medical reference sources, including the ASPCA Animal Poison Control Center, the Pet Poison Helpline, and the Merck Veterinary Manual. This is general educational information, not a diagnosis or a substitute for examination by your veterinarian. DogSafe's severity ratings are our own assessment, calculated from published guidance and your dog's weight. In an emergency, call ASPCA Animal Poison Control at 888-426-4435 or the Pet Poison Helpline at 855-764-7661.