Yes, Leighton, using non-poisonous snakes probably will lead to "false positive" reaction, and if you want your dog to avoid poisonous snakes only, you should train them with only poisonous snakes. However, I've seen dogs bitten by non-poisonous snakes that have resulted in injury to the dog and infection in the bite. It's painful and dangerous, especially if the snake bites the dog on the nose or around the eyes. I'd rather have my dog avoid any kind of snake in the field, so "false positives" are just fine with me. Eapainer more »