KIRK: He kicked my dog when I was a kid … Toto was always different after that.
Yet another reference to The Wizard of Oz. Toto is the name of Dorothy’s little dog in both the book and the film. In the film, Toto was a female dog played by a brown Cairn Terrier named Terry. In the original book, Toto is only described as a small, black, scruffy male dog, but the illustrations depict what looks like a Yorkshire Terrier. It’s possible Kirk’s pet dog Toto, a female, was likewise some sort of small fluffy terrier.
Uncle Louie is made even more unpleasant by not only kicking a dog, but probably a very small dog.