As a responsible pet parent, you know by now that chocolate is toxic to your four-legged family, but do you know why? Or, how much of the forbidden sweet snack is potentially lethal to Fido or Fluffy?

As a responsible pet parent, you know by now that chocolate is toxic to your four-legged family, but do you know why? Or, how much of the forbidden sweet snack is potentially lethal to Fido or Fluffy?