Any pets that taunt?
There are no “taunts” in GW2, at all.
Aggro is handled differently. Mobs choose targets based a few things: Toughness, proximity, healing, rezzing, ranged/melee opponent, and probably other stuff too.
The 2 biggest factors from my observations are Toughness (well armor really) and Proximity. Enemies like to target things with lots of toughness that are close to them (generally).
The problem with your polar bear is that bears have terrible armor values. They are just giant sponges. You will actually find pets like Canines, Drakes, and to a lesser extent Devourers (ranged reduces aggro) with high toughness will keep aggro better than a bear. Of course if you stack toughness on yourself then you’ll pull the aggro more often.
There is no 100% guaranteed way to control aggro but you can manage it to an extent.
Awesome, Unspecified, I didn’t know any of that, thanks!