In one of the organizations to which I belong, there is the most amazing variety of pets on leashes at events that stipulate "no pets allowed". The key is that they are all registered as "assistance animals". You'll be hard pressed to find an actual seeing-eye or hearing-ear dog among the bunch, but there are cats, ferrets, snakes, birds, chinchillas, iguanas, and just about every imaginable type of fur, fins, and fowl there, mostly there to supposedly provide forewarning of seizures, and help allay panic attacks. Talk to any of the owners in private however, and better than 90% of them will admit that they just didn't want to leave their pets at home for two weeks.
A pet is just a pet, but if you fill out the right forms, it becomes a service animal; you can take it anywhere with you, and it's actually a punishable violation of a person's civil rights to ask them to leave a place of business because of it. The food, medical expenses, toys, and accessories also become a tax write-off, apparently.