Do you ever catch yourself playing favorites with your pets?

I've taken care of my aunt's dog longer than my own dog and I am guilty of preferring my own. Sandy was often left in my care and I've learned how to take care of a dog through her. Two years later, I got Clio and I became more attentive to her and did not play with Sandy as much as I used to. Sandy became irritable because of another dog in her territory. She'd attack Clio for no reason and she started peeing in my bathroom when I got Clio as a puppy.