I'm going to take a few stabs here, I'm guessing your Khazard pet has disappeared, so here's a few possible scenarios:
1. Press CTRL + R and it see if he has bugged out in your bag.
2. Re-log. Everybody knows a reboot can fix stuff!
3. Have you dropped it on the floor by accident?
4. Have you sold it by accident instead of repairing?
However, the chances are, you are going to have to find another one, as things rarely just 'disappear'. It usually is a 'player error'.