Nostalrius Begins - Quality wow vanilla realm (1.12)

Hello,

I recently made a hunter on horde side, I have reached level 12 by my pet is constantly disappearing.

I have been feeding it very often and it is showing as happy but I look away for a second and the pet is just gone, I have no message in my combat log and nothing to indicate why this is happening.

I will be on my 7th pet once this one is gone and it is making the game very very frustrating.