I have no experience with the collar but I do have a cousin that trains pitbull to pull weight and its approved competition. His pits look like Hanz and Franz, very muscular and they are very energetic. Just a thought, research competition weight pulling and see if there are any activities suggested that you could use with Duke for his level of energy? Also we took Canelo to a training class to teach him the basics. I loved working with his trainer, I learned so much watching her and learning how she got different dogs to focus. Have you thought about a training class?

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