Cats aren't fun if they don't run. Young GSDs play by biting eachother on the neck. Venus is 16 months, she's always hanging off Otto's neck. He doesn't seem to care just like Morgan didn't care when Otto did it to her. Otto and Venus spend several hours a day chewing on eachothers heads, necks and feet, they don't care.
Other dogs care. I agree with Jane, don't set him up to fail. If he can't play without grabbing other dogs by the neck or tossing little dogs like a salad, he can't play. If you snap the leash on quick when he does it and then leave, he'll learn, oh yeah I'm not supposed to play this way.
Venus of Crooked Creek 1/26/13
Otto von Hena-C 05/23/08
Morgan Donnermond 08/04/01 to 9/28/12 Long Live the Queen!
I have duct tape and I am not afraid to use it.