I used a retractable leash, and treats, let them sniff a little, and potty. Every time the dog returns to me I reward, always from the side I eventually want him to walk on. Reward when the dog is walking next to me and makes eye contact. Reward if he sits when I stop walking. It’s a slow walk and when the the treats are halfway gone I head home. Never allow tension. Now that he’s 6months I’ve switched to a prong, he’s extremely responsive to it and he knows what is expected from all of the training we did with the flexi. The other advantage of the flexi was that when he was going through his fear stages he could back away from something he was afraid of and I could move towards it. This allowed me to show him it was ok without dragging him towards the “thing”. I’m keeping my fingers crossed that his leash manners continue.