I work at a vet hospital and I have to disagree 100%.
With the whole curbside service thing people aren't allowed inside but their pets are. About 75% of the dogs (even the house trained and perfectly healthy ones... especially the perfectly healthy ones) pee and poop in the exam room while we're not looking. Most of those then step in it, traipse it around the room, then jump on us when we walk in and cover our clothes with it. I witnessed a 17 year old white fluffy toy poodle squirt yellow diarrhea on the floor only to turn around and try to eat it before I stopped her.
Cats, on the other hand, might very occasionally vomit in their carrier during the car ride over if they are sick. I can't recall a single time a cat, not even a sick cat, has peed or pooped while loose in the exam room.
It's a running joke now that we should only see cats until people are allowed back in the building to supervise their dogs. Half of our job now is cleaning up after the dogs and we're so sick of it. The cats are so much cleaner.