Uh, like no furries will pay what his time is actually worth. From my experience furries tend to be cheap bastards unless he manages to get really famous in the fandom.
I suppose he could offer one off painting type pieces (which means he wouldn't have to waste time on the stuff thats not seen and rigging), but there would still be the texturing and/or painting and fixing up, depending on how good they are with 2D.
Animations are also potentially good, but goodluck finding anyone who will pay for them :D

The medium he might be able to make some money with would be Second Life, doing avatars and custom avatars or whatever.