 SYNC: In the scene with Stifler and the cake that says  Congratulations Jim, after Stifler is on the ground and Jim is  trying to get the first dog off Stifler, the second dog comes in.  Just before the second dog gets to Jims leg you can see a cut shot,  sort of hidden with a morphing transition. If you pause at the right  spot, you can see two little dogs.