Before you start leash training your puppy, make sure that you are using the proper equipment. Do not start with an extension leash; these are strictly for playtime walking. Your puppy or newly adopted older dog needs to understand that the person holding the leash is in charge of the walk direction and pace.
Find a specialty pet shop in your area, preferably specializing in dog collars and leashes. The more specialized the store, the more knowledgeable the staff (hopefully). Many specialty dog shops also allow you to bring your puppy in for fittings, just make sure that the shop is clean prior to bringing in your new puppy.
Get a leash that comfortably comes to your waist when the dog is standing at your side or slightly behind you. For example; hold the leash handle in your left hand (at your waist), run the leash across your body to your right hand (at your waist) and let the leash fall down your right leg (forming an upside down L) to the height of your dog's neck when standing next to you.
