When a pet is killed it resets the global cooldown for pulling more monsters (D button). Also, shouldn't druid spell damage come off of Wisdom and not int? It doesn't really make sense to have to stack 2 stats to be effective. Wizards only need Int. Druids are required to be high Int for damage and High Wisdom for mana pool. The best druid is a wizard.

I don't think pets getting killed resetting to CD for pulling more is a bug but I do recall pets giving XP and adding to the chain when I first started playing, unless I was dreaming or something, and they no longer do. Now they're literally just an annoyance with no pro.