I was bored, goofing around in Grizzly Hills today, bugging other hunters about Arcturis, when I decided to grab a Grizzly Bear. Froze him in place and tamed him while he was fishing, and when he ran up to my side, his head was arced down, looking into the dirt. I went into an arena, thinking it was like Garwal (R.I.P.), but he kept his silly head pose. Tamed 5 more to test it, and it only worked when they were in fishing position.
Pic is low quality due to this laptop being BAD for gaming, but it's enough to show what the issue is. If you want a manically depressed grizzly bear, head on over and grab one today!
EDIT; The effect disappears upon logging out or entering a dungeon
