How about the Canon EOS 1D? It's a 4.2MP professional SLR, and it's exceptionally well suited for fast pictures like sports or nature photography, which seems to fit what your Dad needs. There are several for auction between $1-2K. A friend is buying one, and I did some research on it -- sweet system.
The Sony is fast for a consumer digital camera (I use one), and if your Dad needs a step up AND it's for business purposes, there's no sense in stopping short of the best. Don't let the megapixel rating fool you because the sensor on the 1D is huge and takes amazing shots.
Just a thought. Not sure if the 10D would be a better choice or not. I'm not an expert just an interested newbie.
BTW, Ridgebacks are wonderful. Our pup is a Rhodesian mix (pound rescue), and she's the best dog anyone could hope for. She's proven that with our newly adopted 13 month old daughter.