From http://www.mmo-champion.com/content/ which is itself from http://blue.mmo-champion.com/t/24702152874/hunter/.We changed pet scaling to make all 3 pet types scale with the same amount of attack power, which should bring the 3 pet types DPS closer together (though Ferocity will still do the most damage, as intended). We want Ferocity to do more damage than Cunning, but not by a huge margin.
We'll see if they actually manage this

Also,
Apologies if this is old news, but I found it interesting!As you've noticed, Kill Command is proving a tricky ability to balance. It's pure attack power and doesn't scale with weapon damage and is based on pet attack modifiers. That's why the numbers swing often dramatically patch to patch. For what it's worth, we think the numbers are getting close now on our local builds.
P.S. Older note:
I hadn't seen this o.oLock Jaw (Dog) *New* - Dog locks its jaws on the target, holding it in place for 4 sec. / 5 yd range, Instant, 40 sec cooldown