and then lost it....

I've got it on Frostwolf server, since all mounts are shared it's easy to get this achievement.
Unfortunately I got it on my lvl 22 char, so I could not use it right away, I just put the dragon into my bag, thinking I will learn it as soon as I get to the lvl 70, but unfortunately after logging in a day later, the dragon has disappeared from my bag!
Is there any way I can get it back?