If a dog bites a toad and foams at the mouth, it is poisoning. Because the skin on the surface of the toad contains toad venom, which is toxic to dogs, dogs will be poisoned after biting a toad. You need to rinse the dog's mouth with clean water first, and then let the dog drink more water. If the dog continues to vomit and does not get better, it is best to send it to a pet hospital for examination and treatment immediately to avoid life-threatening injuries.