Lifting the leg has to do with the amount of testosterone in the system. Even though dogs are neutered the adrenal glands still make a little in both males and females. It stays at a relatively low level unless the dogs are around other dogs, and this prompts the adrenal glands to make more testosterone. Contrary, to popular opinion, it's not seeing another dog left his leg that causes him to do it, it's just a scent from another dog that causes this behavior. |