Chocolate, particularly dark chocolate, is toxic to dogs, due to its theobromine and caffeine content.Ethylene glycol, antifreeze, is extremely toxic to dogs. It has a sweet taste and thus dogs will drink it. As little as 2 1/2 tablespoons can kill a medium-sized dog in 23 days.
If theres one thing dog owners have heard over and over again its that dogs CANT HAVE CHOCOLATE! But why? Is it just something your mom says, or can choco...

Can Chocolate Really Kill Your Dog? If you're a pet owner, you may have heard that chocolate is toxic to dogs, but do you know why?

Dog Chocolate Toxicity Calculator is an emergency assessment tool designed for pet owners. Chocolate contains Theobromine and Caffeine, which dogs cannot metabolize effectively. Even a small amount can lead to poisoning.

According to a WebMD article, a 27 lb dog will become ill after 27 ounces of milk chocolate but just 3 ounces of baking chocolate. In short, a small amount of chocolate wont kill the average-sized dog (but dont make it a habit of feeding it to them!).
Can White Chocolate Kill a Dog? Why Dogs Are Attracted to Chocolate.As you can see, baking chocolate and cocoa powder are especially dangerous even a small quantity can be fatal for a dog.