If a dog bites a toad and foams at the mouth, it may die. This is because the surface of the toad's skin can secrete venom. If a dog bites a toad and foams at the mouth, it is considered poisoning and may die. When you find that your dog has bitten a toad, you should immediately rinse the dog's mouth, and then observe the dog's condition. If any abnormalities are found, send them to the pet hospital for treatment in a timely manner to avoid life-threatening injuries.