I use a harness for my 4mth old while we play ball in public areas. He drags a 30ft lightweight leash due to leash laws..
For walking, we use a Weiss Walkie leash which wraps around his body and hooks to his flat collar. Eventually I will move to a prong but I wanted to try a less intense tool in his puppy stage. I really like the Weiss Walkie leash and it is good for leisurely walks. Not for focused heel training.
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