I lose my pets :(

I've had a problem with my pets. It turns out that I had 3, and two of them have been deleted for no apparent reason. It seemed strange that when I logged out, my character appeared with another pet. I logged back in, and it turns out that one had been deleted, along with another one that was in the stable, leaving me with only one. I would like to be able to recover at least one since it was hard for me to obtain. Please help.

I play in Onyxia, wow vanilla. My hunter name is Cirse