13 yr Malti-poo is obsessive with guarding our shoes, purse, husbands pants or shoes, etc. When we pack a bag with his food, toy, etc and someone keeps him for us, he jumps on the bag growling literaly and would bite if you tried to remove it without distracting him first. He has bitten me at least twice now when I took away some outside shoes that he had been guarding very aggressively every time I walked by. It has been a problem for a while now and gotten worse. We try not leave anything down where he can get to it. It is nearly impossible to get him away without a real battle.