I reported this in another topic. Ended up having to abandon a pet because it had many other problems which made the hunter almost unplayable. It was that one specific pet I had used in Torgast and applied some pet powers to it - at least I think that the problems started around that time.
Friendly players couldn’t also heal my pet which makes the problem that much worse for PVP in combination with the 4 sec revive cast time and overall nonexistent pet capability to stay alive with only mend pet on it.