Kanthela has presented a bug report over at the World of Warcraft forums involving the Boar hunter pet. It seems its Charge ability has become useless.

The Boar's Charge immobilizes the enemy for a second and adds Melee Attack Power to the next attack. However, after patch 2.4, Charge does not generate any threat with Growl.

Taking a long eight days before making a response, Blizzard community manager Hortus said an inquiry has been made on the issue. The last time a hunter pet issue was raised, Hortus debunked an auto-cast Growl bug. Today, the bluepost confirms the Boar's Charge bug. Hortus wrote:

I have confirmed with the developers that Boar's growl ability getting such a large bonus to attack power based on charge is a bug. Growl should only benefit from the hunter's attack power and get no benefit from buffs to the pet's attack power.

Expect this to be changed in a future patch. If you disagree with this change please post about it in the suggestions or class forums.