Question from Melissa Stillman: My husband and I lost our five-year-old Pomeranian suddenly in October and our four-year-old rescue black Lab/Chow mix has been acting out and suffering separation anxiety and has bitten one of my cats and a friend's dog (both requiring vet visits) He seems more affectionate with us but also less secure. We let him run off leash on the beach every morning so he will be tired while we are at work and he has a dog door to get to the backyard but he has destroyed our belongings and eaten a man-sized hole out of the couch. Also he seems more aggressive with other dogs when we walk him on a leash and he'll instigate fights with other males. I'd appreciate any advice to deal with our problem child—we love him dearly. Thank you in advance.