keep taking the dog for walks...you are on the right track.....allow the dog to explore, yet still maintain very passive control (at this young age) When the dog, gets stubborn, command here, quick tug, and start walking the other direction. When the the dog is 4 months old, begin putting on the pinch collar (may sure it fits properly) Begin introducing here, sit (on the whistle) and heel......light corrections at first. Because your pup will have been introduced to this during your walks you are doing now, this will be a piece of cake.....also, remember to take your dog to a safe place and let him walk without a lead (to develop his independence) With a chessie, they quickly catch on to that!!!!
