Or your computer keyboard?
Bugs' science experiment was to prove that a dog's mouth is just as dirty as human hands.
Top left: Cell Phone
Top right: Dog's mouth
Bottom left: Keyboard
Bottom right: Squirrel's thumb
What he found out was the Uncle Ben's cell phone and the keyboard at grandma's house were other things that were just as dirty as his hands.
Lesson learned - Wash Your Hands!!
His grandfathers' determined that he most likely cultured some form of strep. Oh and he received an A+ on the experiement!