If Hiro is getting too rough with his toys (barking excessively, biting, nipping, and just being too crazy) when I am playing with him, I take them away and ignore him until he can play nice. When I go back to continue play with him I go slowly so he understands what kind of play is ok! It seems to have worked for me... but my husband is his partner in crime and is straight up rotten when they play together.
