1.) Randomly breaking camo!
2.) Pet summons occassionally with 10% health and if the bar doesnt have time to auto fill before combat is initiated he can die instantly.
3.) If u dismount and are forced or rush camo and the pet delays coming out (never lets u call him to speed it up if hes already summoned) when u camo the pet will not be.
4.) Let's say I'm doing dailies and horde who love to do AoE's hit me so after i kill my mob my pet naturally charges. Not a problem I just recall him but then it's as if he stays on passive from there on out while i attack mobs unless i resend him manually to attack. (doesnt sound like assist works very well to me)
5.) The pansy and the beast - Pets are either made of wet paper or hardened steel. (i believe the turtle is the only hardened steel one ive seen)
I know there are plenty more im just drawing a blank atm.