Why a 10 kg dog can't handle even one penny
Zinc toxicity starts at surprisingly low doses for medium-sized dogs. Your 10 kg pet has eaten multiple pennies, each containing about 2.5 grams of zinc—far more than the amount that causes vomiting, lethargy, and red blood cell damage. The mould coating adds mycotoxins that attack the liver separately, making this a double assault on your dog's system.
Unlike food poisoning that passes quickly, zinc keeps releasing from the coins as they sit in the stomach. This means symptoms often don't appear for 12-24 hours but then worsen over several days. Your vet needs to act before that delayed reaction begins.
What the mould does beyond the zinc danger
Basement moulds like Stachybotrys or Aspergillus produce toxins that cause tremors and liver inflammation. Combined with zinc's effect on red blood cells, this creates overlapping risks. Watch for yellow gums (jaundice), black stool, or sudden weakness—these suggest both toxins are taking effect.
The pennies' age matters too. Older coins may have copper plating that's worn off, exposing more raw zinc. Bring any remaining coins or the chewed bottle to help the vet estimate exposure levels.
Why X-rays won't wait until morning
Vets will want radiographs immediately, not just to locate the coins but to check for perforation. Sharp edges from chewing can tear the stomach lining as zinc corrodes. Your dog's 10 kg size means even small tears become critical faster than in larger breeds.
If coins have moved to the intestines, surgery may be needed to prevent zinc absorption during digestion. Blood tests tonight will establish a baseline for hemoglobin levels, which will drop steadily if zinc poisoning progresses.
The critical first 12 hours with zinc coins
Don't wait for symptoms like vomiting or pale gums—by then, zinc has already started binding to red blood cells. Your vet will likely administer IV fluids to protect the kidneys and possibly chelation therapy to bind circulating zinc.
Bring a sample of the mould if possible. Different moulds require different treatments, and knowing whether mycotoxins are present helps the vet prepare for potential liver support. Time matters most with zinc—the sooner treatment starts, the better the chance of stopping anemia before it becomes severe.
For a dose worked out against your pet's weight, use the Zinc & Coin Toxicity Calculator.