I have two cockapoo puppies, they are brother and sister. They are almost 9 months old. THe male dog is very possessive over me, his toys, his food, anything that we hand him pretty much. If the female dog does as much as walk by him he growls, sometimes even snaps at her. If I am holding the female, he will jump up and try to bite her. This only happens every few days. Most of the time he is the most lovable dog but when he snaps, it gets ugly. Any suggestions for me? Thanks!