I've been running into this with all pets lately and i don't know what causes it.
I'll teach my pet both sprint and charge in the talent tree, it will use both. Then all of a sudden i notice the pet no longer charging, and i check the spell book and it no longer has charge as a move. I check the talent tree, and it still says it knows charge. Has this been happening to any of you and do you know how to fix it? I can't seem to do anything to fix it other than respec the pet, but it will eventually lose charge again.