There was recently a discussion on Facebook about whether or not service dogs are allowed in tattoo shops. Apparently some people with service dogs have been told by shop owners that service dogs weren't allowed because it was a health hazard, because dander from the dogs could get under someone's skin and cause an infection or serious allergic reaction. Other people had been taken their service dogs into tattoo shops with no problems, however.
What was a bit odd to me was that some of the people that had been told they could not take their service dogs into tattoo shops accepted this and thought it was reasonable. They said things like, "You can't take your service dog into the operating room when you have surgery. A tattoo shop is the same way. They keep it really clean and use sterile needles and stuff."
Well, most tattoo shops are not like operating rooms. Most people do not get tattoos in operating rooms. If you do get a tattoo done in an operating room, you probably won't be able to have your service dog with you. But I've never heard of a tattoo shop with its own operating room.
Tattoo shops probably are really clean. So are dentists' offices and doctors' offices and many other places where service dogs are allowed. Being really clean does not make a place an operating room and does not mean service dogs are not allowed.
Hopefully tattoo shops do use sterile needles. The pharmacist at Rite Aid who gave me my flu shot used a sterile needle, too, but I didn't get my flu shot in an operating room. Service dogs are allowed in Rite Aid and other pharmacies, of course.
For a definitive answer, I called the ADA Information Line and was told that a tattoo shop is not considered a sterile area and that service dogs are allowed in tattoo shops under the federal law.