What a very nice thing to do and I'm thrilled to hear that the kitty also got adopted. The rescue group,FOSMAS, where I adopted Colby, Radar, Reece, & Rory, also does this. It's on the petfinder site and you just need to click the purple sponsor me tab in the upper right hand corner from the animals name. Then you can pay towards that animals adoption fee. I anonymously paid for most of the adoption fee towards a kitty that I knew that my co-worker and her daughter were interested in. I did tell the kitties foster mom but I didn't want to tell my co-worker or her daughter. They did end up adopting the kitten and were thrilled that he had already been sponsored.