Warren Foster managed to get a bit of variation in his stories for the Tweety-Sylvester series by adding a third character who got directly involved in their dispute. Sometimes it was Granny, but there were cartoons where she just wandered off and was away from the action.
In “Snow Business,” Foster introduces a starving mouse. Instead of the cat chasing the mouse, it’s the other way around. I like the “two-headed” mouse below.
Sylvester’s so intent on eating Tweety, I suppose it doesn’t cross his mind he could eat the mouse.
Animation is credited to Art Davis, Ken Champin, Manny Perez and Virgil Ross. I wonder if Warren Batchelder or Ted Bonnicksen assisted on this one.