Hmm...mental note:

1)Find camera
2)Drug dogs so they sit still for pictures
3)Take as many pictures as camera memory will hold and hope 1 turns out
3)Stop by vets for anesthia for cats
4)Administer anesthia for cats
5)Place cats in the same room
6)Take pictures quickly before anesthsia wears off
7)Use photo shop to make it look like cats are happy to be near eachother...
8)Mail Christmas cards