Hunter Pets have no abilities

i guess u guys know the prob. im almost geard enough now to start with my mm hunt arena´s i tried to get a spider cause of the 4sec immovable but seems like that there is no spell added to spider i took the one from terrokar forest. if im an ***** and it is working with some other spiders just tell me name pls. I mean its a very usefull abilitie and would make hunters quite more usefull bg/arena thanks a lot

Before you capture or tame the best, you can always use Beast Lore ability to see if the target beast has the required ability or not.

Although, off-topic, I would suggest getting a Scorpion for Arena if you're playing MM hunter. You can thank me later.