Might try the bike thing. He will chase a ball but then the competition is on with him and my GSD. She has a little possession issue right now, something else to work on! Problem is too, he has to be muzzled in case he chases a little dog, he has never learned not to yet. He can be around little dogs as long as they don't run or act like a victim - I know he has no aggression, just very immature and we think he had little or no socialisation with people or dogs. He's scared of people BIG time.
How do you reduce a photo to a size that you can upload onto your posts? I'll put some of mine on