Clodagh
Playing chess with pigeons
I didn't say anywhere to stop ball chucking?
I just think ball chucking with more than one dog can be a recipe for disaster (depending on the prey drive/possession levels of the dogs in question) and it is not something I would do.
It's also a pretty high impact exercise for a young dog in terms of sudden stops, turns, landings etc.
I always now throw a 'running rabbit' along the ground, it's a more natural prey movement, rather than throwing into the air, which risks the dog jumping and twisting and landing awkwardly. Seen too many needless injuries and having had a dog that used to chase birds, not something I want to encourage!!
It was ball throwing that led to my friends dogs £10k spinal surgery.