After a young man is bitten on the hand by a radioactive snake, his hand changes into a lethal snake head, which attacks everyone he comes into contact with. Also, his body becomes filled with snakes. Now, he must prevent himself from hurting others.
Not technically. A man towards the beginning tells the main character that his dog was bitten by a snake and had died, but it turns out that was a lie. The dog, depicted entirely by a puppet, is seen later, deformed by the radioactive venom of the snake, then it attacks and kills the owner and is never seen again.