Can Hamsters Eat Chocolate? No — It Can Poison Them

Why chocolate is dangerous

Chocolate contains methylxanthines, theobromine and caffeine, the same compounds found in coffee. The ASPCA explains that the darker the chocolate, meaning the higher its cacao percentage, or the higher the caffeine content, the greater the risk of toxicity. Baking chocolate and dark chocolate carry the most; white chocolate carries the least, but it is still not a hamster food.

Size is what makes this so serious for a hamster. A Syrian hamster weighs only a few ounces and a dwarf hamster far less, so a crumb of chocolate that would barely matter to a person or a large dog is a much larger dose for an animal that small.

What to do right now if your hamster ate chocolate

Take any remaining chocolate out of the cage and out of the cheek pouches if you can do so gently; Merck notes that hamsters often store food in their pouches or hide it around the cage, so check bedding and hiding spots too. Note the type of chocolate and roughly how much is missing.

Then call. Your veterinarian, an exotic or emergency clinic, the ASPCA Animal Poison Control Center at (888) 426-4435, or Pet Poison Helpline at (855) 764-7661 can tell you whether the amount is a concern. A fee may apply for poison control. Do not wait for signs to appear before calling.

Signs to watch for

The ASPCA says the methylxanthines in chocolate and caffeine can cause vomiting and diarrhea, panting, excessive thirst and urination, hyperactivity, an abnormal heart rhythm, tremors, seizures and even death. In a hamster, you may see unusual agitation or running, shaking, wobbling, loose droppings or a hamster that suddenly becomes still and weak.

Merck notes that digestive problems are common in hamsters and that diarrhea, often called wet tail, shows up as wet fur around the tail, low energy, poor appetite and weight loss. Any of these after a chocolate exposure means the hamster needs a vet the same day.

Chocolate hides in many foods

Chocolate chips, cookies, brownies, cocoa cereal, hot cocoa powder, chocolate-covered raisins and nuts, and many granola bars all contain it. Coffee grounds, tea leaves and energy drinks carry caffeine, which the ASPCA groups with chocolate as a risk.

Sugar-free candies and baked goods bring a second danger. The ASPCA warns that xylitol can cause low blood sugar and potentially liver damage in pets. Keep all sweets, baked goods and drinks well away from the cage and out of reach during playtime.

Safe treats to give instead

The Merck Veterinary Manual says a commercial rat or mouse pellet with 15 to 20 percent protein meets a hamster's needs, and that small amounts of fruits, vegetables or treats made for rodents are fine, as long as treats make up no more than 10 percent of the diet.

VCA Animal Hospitals lists suitable hamster treats, given once or twice a week, as seeds, nuts, pasta, unsalted popcorn and whole grain crackers, with fresh vegetables such as leafy greens and yellow or orange vegetables offered daily in small amounts. Any of these is a far better reward than a sweet.

Hamsters hoard food, so check the corners of their hamster cage for stashed fresh food every day; a large hamster cage with deep bedding makes those hidden stores easier to find.

When to see a vet

See a veterinarian who treats small mammals right away after any chocolate exposure, even if your hamster seems fine at first; it is far better to call early than to wait. Bring the packaging so the vet can judge the type and amount of chocolate.

Book a visit too for any hamster with wet fur around the tail, diarrhea, poor appetite, weight loss or unusual lethargy. Merck notes that stress and diet changes make diarrhea more likely and that some antibiotics are dangerous for hamsters, so never give medicine unless a vet prescribes it.

This page is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your pet.