I decided to have my pups model for me tonight for a little bit so I could test out my new backdrop. I really love it! I got my 580EX set up with a white umbrella and went to town. They didn't mind too much, luckily. In case you didn't know, the grey one is Lola and the black one is Diego. I often refer to them as my furbabies.
I think next time, I'm going to pull the backdrop out onto a small table and have them stand on it so it'll all be seamless.