A while back there were some issues with hunter pets and their aggro building since a Boar’s charge ability was causing high threat and then instant casting growls right after. All the confusion aside it seems Blizzard has fixed A LOT of bugs in Patch 2.4.2
Growl was scaling incorrectly before so it’s been changed to [...]

I’ve spent most of the day today testing hunter pet aggro .
First let me say that Growl and Charge interaction is not the same as it was in 2.3.3, this is being looked at separately by the developers lolwut. I’m specifically looking at the reports that other pets are not not holding aggro as well [...]