Great assignment and funny too because I've been working on this very thing this year. Once a week we take some friends and neighbors dogs for a run and I've been trying to get some good shots of them in action. Nothing stellar here, but I was pleased with some of my shots. Fun trying anyway...
Blaze - great ones of the Thunderhole and of your kids. While hiking this spring I tried to get one similar to the from-below photo of your daughter jumping the split rock; but my dogs were not as cooperative as your kids, and I wasn't quick enough.