Bitter Apple Spray

Bitter Apple Spray is a spray that people use on their furniture so dogs will not chew on the it. Dogs supposedly hate the taste of it. The Heffleys used it when the owned their dog, Sweetie. Manny is said to love the taste of the spray, and puts it on all of his food.

It appears in Diary of a Wimpy Kid: Cabin Fever

Trivia

 * There is also a real life item called Bitter Apple Spray.