Fred the Dog
My mother and, later my sister used to raise Australian Terriers. It was difficult to see long shots of Fred, Cinderella's dog, but he sure looked like an Aussie Terrier. He is too big and he has too coarse of a coat to be either a Silky or Yorkshire Terrier. I have only seen the color combination of blue/black saddle over an orange/red body in those two breeds and the Australian Terriers. Some Australian Terriers are solid red, but others are in the color combination seen in the film. It's called "Blue" in the breed.
I am wondering if anyone can confirm the breed identity.
The best diplomat I know is a fully charged phaser bank.