I work in rescue. Have you ever looked into the eyes of a dog that has been beaten, abused, nearly starved to death, and so badly neglected it is covered in ticks and fleas, infested in internal parasites? Have you ever seen that? Ever looked into the eyes of an animal that has EVERY reason to hate humans, especially its owner, but it still loves. It can still wag its tail, lick your face.
Your clients dogs still love their owners because dogs are FAR from being the "inferior" species.
That is how I explain that.