Can dogs die from milk chocolate?

They can. Chocolate in moderate amounts (one candy bar) is toxic to dogs.

In addition some times the affect of chocolate on a pet is very very unpredictable. Therefore sometimes a small amount can cause a fatal arrhythmia in a pet.

Here are some additional details and a link.

Chocolate contains substance known as theobromine that is difficult for dogs and other non-human animals to metabolized. I can be fatal to dogs, cats, horses, ferrets, bird and other pets, according to the Ontario Canada, SPCA.

The dog or animal should be induced to vomit because the theobromine in chocolate is toxic to some animals even though it is safe for human consumption.

The dog or other pet should then be rushed to the vet because the theobromine and other stimulants in chocolate can induce a fatal heart arrhythmia in some non-human animals. The dog may or may not need to have its stomach pump, but a vet needs to make that determination.

Cooking chocolate is the most toxic, followed by Dark Chocolate, followed by milk and white chocolate