But, big water moccasins can certainly kill a small dog or cat. Their hemotoxic venom breaks down blood cells and tissue, causing
severe swelling, pain, necrosis, and potentially fatal effects if untreated. I’ve come across many moccasins around my house. Just another reason my cats are indoor kitties (although cats have quicker reflexes than snakes—20-70 milliseconds—and swat with extreme precision. They could come out on top in a showdown). 
