King Of The Hill Episode 7.20 Racist Dawg

When Hank nearly kills the family after improperly installing a new water heater, Peggy calls a repairman, much to Hank's dismay. Unfortunately, the new repairman is also unsuccessful at fixing the water heater because he is attacked by the Hill's dog, Ladybird.

When the black repairman accuses Ladybird of attacking him because she is racist, Hank is determined to prove it isn't true and enlists Bobby to help. They watch rap videos with Ladybird and eventually take her to a dog trainer who accuses Hank of being racist, not the dog.

Hank is beside himself with embarrassment and outrage over this accusation and agrees to take a computer test at work to prove it is untrue. When the test confirms that Hank "prefers the company of white people over black people", he starts to question himself.

That is, until he hires a white repairman to fix his water heater and Ladybird attacks him as well - proving that pets do receive subconscious messages from their owners, in this case that Hank does not like repairmen, not that he is racist.