I need help retraining the leave it command with my very drivey gsd Jake. He will "leave it" with almost everything. Will leave food, will leave the cats if he is pestering them, etc. But will NOT leave toys. Especially outside. Inside he will give them up, outside he won't. Which is ok sometimes, I like it when he plays with the others with a ball his mouth, because he doen't play as roughly that way.
But he also is the "toy" police. He takes all the toys the other dogs play with, and won't allow them to have them. If he takes the frisbee they are playing with, he won't give it back to us either. He will come, he will down, he will NOT drop it. The only "fights" we have ever had here, have been over toys. He growls if a dog tries to take his toy, and if a foster doesn't heed the warning he will snarl and scuffle a bit. So there aren't any toys left out in the house, esp when visitors are here.
I've tried making that end play time, he doesn't care, he wasn't playing anyway most of the time.
I've tried exchanging it for tastey treats. No go.
I've tried out muscling him, works sometimes, if I stand on the frisbee, eventually he gets sick of holding it on the ground.

I now give him a ball when we go out, so that he will let me play with the others, or not take him out when I want to play with the others. BUT, I would like him to have a reliable out command. He has been known to pick up the neighbors kids toys that migrate into our yard, and I would like to get them back from him before they are chomped to hell and soggy!
I should also mention that he isn't AS bad one on one. If I take just him out, he likes to play fetch a few times, before he refuses to give it back.