Thanks for the compliments! Keeping one dog still is pretty easy... "up. sit. wait." Keeping all three still (and my son) at the same time was a three-hour circus.
I like to take pictures for fun, but once you start charging people, the pressure is on, there is a much higher expectation, and a lot more demands. When family asks me to do pictures, I always do them for free. That way if the pictures suck, they can't complain.