Good thing you got the new dog when its a pup, i got my dog when it was a few years old and some things were hard to train (like when he goes for a walk, he is constantly pulling the leesh, nearly strangling himself trying to pull forward so hard, and he can not be let off it when we go walking as he just runs around everywhere and doesnt listen to commands to come back). I dont know wether my dog was this hard to train just because we didnt get him when he was a pup, or maybe because when we got him from an animal shelter we were told his previous owners mistreated him (not to sevear happend to him, but its obvious there are certain things he is afraid of).