Growing up, every dog we ever had belonged to my mom. Our first Yorkie really was. He and I had a love/hate relationship through most of his 11.5 years. Sometimes, he was downright MEAN to me. And I tried SO hard ...
Ozzie, on the other hand, is ALL mine. He does love my mom though. And the minute I leave, he becomes HER dog. And every morning, as soon as I open my door, he goes straight to her room to make sure she is there. It's the funniest thing. I really do think they, more than most dogs, single out a person as theirs. I'm not sure there's anything you can really do about it.
I think it's been hard for her to be second banana but I think Ozzie loves having a back-up.
And if I scold him for something, guess where he runs?
What's funny is that she will often tell me, "He is such an angel until YOU come home."
Toby the Cat showed up as a baby last year and he is all HERS! Biggest mama's boy I ever met!