Are Black Widow Spider Bites Fatal To Dogs?

Are Black Widow Spider Bites Fatal To Dogs? These spiders carry a potent venom which is a neurotoxin (a-latrotoxin). Dogs and cats bitten by black widow spiders may show clinical signs of severe muscle pain, cramping, walking drunk, tremors, paralysis, blood pressure changes, drooling, vomiting, diarrhea, and death. Can a black widow harm a dog?