Originally Posted by
Microwave
Neither service animals nor the owners that are legally entitled to them are required to publicly brandish themselves as such. It's a matter for the passenger needing the accommodation and the company providing the conveyance; other people do not need to be privy, and I find it least intrusive and embarrassing to leave the matter at that.
The label for many service animals is so that they can perform their job without being interfered with by strangers. A guide dog for the blind will become distracted if you come up and pet it. The dog has been trained to different standards of behavior if it is working and if it is not. If you treat it as though it is not working, it will go out of working mode.
I'm not sure if this is true with emotional support animals. As far as I know, they are working all the time, and do pretty much the same thing all the time, so there is no benefit to identifying them.