I didn't *have* to. It wasn't sick or anything like that. But I did have a few areas of concern, such as what I thought was discoloration around the gills, and some other oddness around the gills. I was just wanting a vet to look at it and see if it was healthy or not. Being a new pet that I just got a couple months ago, I mostly just wanted a general check up. The vet was able to tell me my axolotl is a female, though. I didn't know the sex before, and figuring that out was one of the things I asked the vet for.I was just wondering how come you had to take him to the vet?