Hi, I'm not an expert by any means, but have a Vizsla myself. My thoughts are taking a him to an off-leash dog park for 1.5-2hrs a day. The impression I have with my V is that he needs it everyday to maintain an even temperament and obedience. We started off off-leash after getting the come here command down pat. I'd practice in my living room with my husband (each calling him and treating him). This progressed to practicing outside on leash, then off-leash at a park with a fence then no fence. I don't know what your level of experience is with training. But I've never met a V that is satisfied with walking on leash. The one's I've met in this age group are similar to high-energy toddler boys who only want to run around and play. If you tire him out, he'll settle enough and focus on your training, be less "zoomy" towards strangers. Even if I miss a day or two of taking him out, it's like his energy just stores up and then I'm at the park for 3+ hours or sending him to day care for a full day of play. Just my thoughts. I wouldn't say that he doesn't respect you per say, just that he can't focus and maybe consider training him in the evenings every day on the commands you want him to follow, try adding hand signals. I'm sure a trainer can also help. Goodluck!