Running with a leash perferred.
I currently have two dogs (one medium and one large) that I have had from 8 weeks to 6.5 years old and 8 weeks to 3 years old. All three of us are very active and I hope to be equally as active with your dog! I have a large SUV so could plan some longer sessions together (hiking, trail running, etc) to accommodate your dogs needs. I prefer to work with higher energy ...