Do any members here go running? If you do, do you take your dog? How are they? Do you run with them on a lead/flexi or off the lead? I plan on taking mine once he's fully trained. Also, what age should they be? We pick him up in 2 weeks. Obviously he won't even be going for walks until had all injections. I don't want to injure him or tire him out to much to the point of exhaustion.