Will worms kill your puppy

There are many different kinds of worms, such as roundworm, tapeworm, heart worm, hookworm, etc... Different worms need different treatments but any kind of worm is NOT a good sign. They all have the potential to be fatal, yes, as they can cause bowel obstructions and/or lead to other diseases which can cause death. Your puppy should be examined and treated by a veterinarian if you suspect worms.