One of the more difficult things to do is to tell if your dragon is a boy or girl. In most cases, this can't be done until the dragon is older, at least 3-4 months old, but sometimes it can be done at a younger age if the dragon is big enough. However, sometimes you can be surprised and think you have one sex of dragon, and when they get older you find out it's the opposite. There are a few ways to tell the difference.
The best way to tell if you have a male or female dragon is to put your dragon on a flat surface, then gently lift it's tail above it's head. Be careful not to lift the tail too far or you may hurt the dragon or break something. Just above the visible opening (the vent) you will see either one or two 'bumps'. If you see two bumps, you have a male.
In a female, you will see either see one bump above the vent in the center, or it will be flat. In the case of this dragon, it's flat.
There are other ways to tell if you have a male or female, but only if you have several dragons to compare with.
*Male's tail will taper slower
*Pre-anal pores are larger
*Female's head will be smaller than a male's.
*Male is almost always larger in general
In this picture, the male (Ozzie) is on the left, and Maple, the female is on the right.
The above descriptions are for most dragons. You may have the occasional few who you won't be able to tell one way or the other until much later in their life. In most cases, you should be able to tell by 6 months of age.