The law is changing for emotional support dogs. In mass anyway we don’t have to take them if the driver doesn’t want to. It’s not the same as a service animal.
Dude. It’s a dog, not a dragon. Do the ride, get the pax to their destination and move on with your day.
Keep a lint roller in the car, and some wipes. You’ll live.
Fuck em, hand them a sticky lint roller and tell them to clean up after their dog and 3 star them so you dont get paired with them again.