being a small puppy of a small breed they need more outings as they bladder can't hold as much or as long as your Golden can.. so he goes when Rocky goes.. but the rest of the time he goes when and where he needs to.. you just need to take him out/make him go to the bell more often in between those times ..
he might be getting the part of go out with Rocky to pee.. but no the part that he can and has to go on his own too..