S7, E20: Hank fails to install the new valve on the water heater correctly and it causes a leak. Peggy hires Mack, an African American repairman. When Ladybird attacks Mack, he accuses her of being a racist dog and quits. When a dog trainer tells him that Ladybird subconsciously follows Hank's lead, everyone accuses Hank of being racist too.