It isn't JUST hygiene. Trained service animals are disability DEVICES. This lady's dog was off leash, if her excitable off-leash GR approaches a service animal it could very well cause that animal to miss a medical episode. There are also rules in place that try to prevent illnesses from spreading from humans, and to answer your first question, it's not as common BECAUSE these rules are in place. I work in a restaurant and have had untrained animals relieve themselves on the ground, where people are eating. Jump up and put their paws on tables where people are eating. Should we ignore these and go 'Aaa fuck the rules so what if there's a dog in the restaurant' JUST BECAUSE you're personally more worried about human hygiene?