I agree, the Underdark is beautiful. If not for that pescy bulette, it would be perfect.
There is a bug with the ball throwing? I never encountered any problems.
Everytime I tried to throw the ball towards the dog, it would act as if I attacked it. Once the other party members attacked me for attacking the dog just by playing fetch. That was entertaining.
I think if you throw the ball and accidentally hit the dog, that triggers the attack. You have to throw it near the dog, like a few feet away, but not directly at him. He will run up and fetch the ball and bring it back to you. It's really very cute
