Is Chocolate toxic to dogs or cats?

Theobromine and caffeine in chocolate cause toxicity. Baking chocolate and dark chocolate contain far higher concentrations than milk or white chocolate. As little as 1 oz dark chocolate per pound of body weight can be fatal.

Toxicity is dose-dependent. Your dog's weight and the quantity consumed are both important - include these when you call poison control.

Cats are less likely to seek out chocolate than dogs, but theobromine toxicity is equally severe. Cats lack the sweet taste receptor, reducing incidental ingestion, but chocolate left accessible can still cause poisoning.