"While we've received a number of questions and some feedback regarding the pet battle system added in the last beta patch, we're in the process of disabling this feature. We know a lot of you are very anxious to test out pet battles, but it wasn't our intention to introduce them to the beta at this stage, as we don't yet feel they're in a solid enough state to allow for meaningful feedback.
One we're further along in development, we look forward to implementing pet battles and gathering your thoughts on the feature."
I hadn't even gotten to try it yet because of all the crashing. And my pet journal being empty. I finally copy my pet collector to a new realm to get my pets back and travel to the middle of nowhere to stop the crashing... and now that I've fixed the problem they won't let me beat up on wild critters.