Leash Training a Puppy
To keep you pup from pulling while on a lead, carry small treats in your hand. Let him get a sniff of them - every once in a while pop one in his mouth. Should be small enough that no real chewing is involved. Then "good boy" him. After a while you won't need to carry the treats. It takes a while of every day training but it will work. Give him a command with each treat such as 'easy', heel, whatever you want. He will be close to you but not at a rigid heel.
Source: Obedience training
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