I have two sweet dispositioned female maltese dogs, Pearl 2 yrs old and Winnie 11 months old. Pearl is grumpy towards Winnie. Sometimes she visciously growls at Winnie, Winnie eventually whimpers and puts her head down and Pearl licks her eyes. Pearl is always sweet to all humans and spends most of her days playing with Winnie. But when it comes to food, position on the couch or bed, and human attention, Pearl growls and barks like she’s about to attack her.