Nostalrius Begins - Quality wow vanilla realm (1.12)

New hunter here, I've tamed 3 different pets and fed them up only to have them completely disappear. When I try to summon a pet I get the message I have no pet and there's nothing in the stable masters.

Not sure what to do except keep trying.

Could you describe some more details?

The only time I have seen this happening is when they have not been loyal. There has always been a message to say that they abandoned. Same as retail vanilla.

Feeding the pets isn't enough they have to rank up in loyalty, which can take some time (and is helped by doing instances, changing zones, etc.)