no, not hostility, sarcasm ..you deal it quite often from what I read 
I have posted this to the imms of course, but you can lose your pets if you...
1, log when you cant see them
2, they flee behind a guard
3, ever try to do gear or deso you cant bring them
4, someone collects a contract and you get the reward while not online.
5, you get ploaded for any reason
6, every single saturday night (not sure why...)
7, at the end of the month rare purge..
4,5,6 and 7 all hinge on the same issue I believe, that is if you are not online and anything is changed on your character you get pet-purged. This IMHO is the largest source of the "Bug" as there is nothing the player can do to prevent the loss of pets.
To add, there are things you can do to prevent #2, however all of these things...sans using recall orb's instead of fleeing (though in truth that in itself is a forced lag at a temple) force the player to have to weaken themselves (entomb or order all sleep for necros at least) in cabal warfare. Yeah you could "not go for the standard" but this, IMHO, is not a good answer...its like saying, meh, since your pets can go where you cant..well..you cant win in cabal warfare.
If I had my way we would go back to where the pets return to you when you log, as that had far less of an impact on combat than the current state. In the past you could log and get your pets centered back to you, this let necro's go to gear and desolation without risking their pets being scattered because even the ability to use summon to bring them to you is broken. This didnt really hurt PK because you had to let the blood cool before logging nayways, and if you did that you effectivly got away.
Want to not let people log to bring pet sin, well then fix all these bugs that really just take necros back to the day where you spent 99% of your time just fighitng the same mob to raise zombies and never got to really enjoy the pk side of the game.