I'm guessing that France maybe doesn't have the ADA. When people with disabilities (seen or unseen) request help, ADA says they don't have to "prove it" to get help. I can't ask what their disability is, not that it would really help to know, just what they need help with. I don't work for Disney, but I do work for an airline so we do deal with folks with a variety of needs as well. In our area, I've noticed more emotional support animals, and even a few untrained medical needs dogs (sense seizures, etc). It's delicate, I have to ask questions, some folks understand, others assume I think "they're trying to get away with something". It's really tough.