Oh, folks, don't limit it to pets! My Great Aunt spent much of her childhood being called Edith-Ethel-Elizabeth-Florence-BERTHA! Her mother would just run down the list of daughters until she got to the right one! I have a niece who I have always been told looks "just like" I did when I was her age. She, of course, was often called Kar-uh-Jessica when being scolded when she was small! People do it to people all the time, why not just throw the pet's names into the mix!?