Ebony has so much engery if I dont give her a lot of excersise she is bouncing off the walls. She is crate trained so that does help a lot. She always goes in her crate when we go somewhere. My hubby got me a new bike for Christmas, my son got me the springer. Have you heard of those? You hook the dog up to them and they ride along with you on the bike. It is awesome! Ebony loves it and it gives her a good work out. It is well worth the money. You might think about getting one. I bet it would help Grant out a lot. Best of luck to you and Grant. (((Hugs)))