You have to go to the level "Must Be Something I Ed". After the Johnny part, go to where the dog is, then go to the left bottom and move towards the middle. You will see the dog poop.
P.S. You need unlimited stealth.
If you want to lose an Ed, you have to find a circle platform, then find a board that comes from any side, then do fast/run if you have it, then after that, run very quickly around the circle, go across the board and you will lose an Ed.
P.S. To get him back, you have to near where you lost him.
Get a 100% game by collecting all the jawbreakers to unlock:Fast run, Unlimited Stelth, and Unlimited Damage