Sometimes bad things happen to good couches... very, very bad things.
Reupholstering is awesome, but hard. If your couch cushions are ripped, but the rest of your couch is intact, why replace everything? This instructable offers an easier solution.
Note: O Skylos Rex (pictured) is innocent. He was used for re-enactment of a crime committed by another dog.
Step 1: Damage Removal
The level of destruction exerted on your couch is will determine how much must be replaced. In this case, only the tops of the cushions were... eaten.
First, remove the cover from the cushions.
Next, using a seam ripper, remove the damaged portions of the cushions. Set the removed portions aside, you will use these as a pattern for the replacement fabric.