Still helping the dog if they require it and dog is successful , until dog will do the desired behavior on command. This phase of teaching our dogs will be the phase that requires many repetitions, still working in the house by now your dog know what you are asking from them and will be able to do the heel when asked for maybe up to 5 or 7 steps in a row, I suggest doing 3 ten minute sessions per day in the house , when you feel this is going really well , We will move outside , the backyard , we are adding in a distraction the environment. We need to start back at the learning phase, to our dogs this is all new and they haven't done the heel outside , we start with one step say heel and mark "yes" and feed. Our dogs will start to understand that what happens inside is the same as outside. Get the repetitions in here and when your dog is progressing well , we can move to the front yard or front street , and we start back at the learning phase once again, to show our dogs where we want them , and also that in all environments we want the same position , again we will have to do many repetitions here , Because that is how all dogs learn is through repetitions, the more you put into this phase , will be rewarded in future walks , if our dogs run to the end of the leash , we simply turn and walk in the opposite direction. I often tell my clients to use their dogs meals for this instead of treats to avoid overfeeding. Also dogs really like to work for the reward, and learn really quick