hi all, we have a 10 week old F1BB mini labradoodle. Oakley is not fully vaccinated so most of the time he's off the leash in our fenced in backyard. We have ventured out around the neighborhood a few times on his leash to orient him a bit. I just defaulted to a standard retractable leash. I fear it is going to be pretty difficult to train him to walk on left heel with that. Any recommendations for a better training leash? And any advice on when to start left heel training? We have two young kids who are desperate to hold the leash. Is there a scenario where Oakley could walk with my wife or I with a short training leash (on left) and have a little more freedom to roam with a retractable lease with the kids? Or is that too confusing? Finally, does he "graduate" to a retractable leash eventually or if we are going to train left heel walking, is he always on a shorter leash, leaving my side only to go potty? Sorry, lots of questions!