Bad to the bone boxer

Michelle loves her new boxer, Tombo. He's cute and energetic, and Michelle can't wait to play with him and her best friend's poodle puppy, Buttons.Tombo likes to chew things. A LOT. He's destroying everything - furniture, clothes, shoes and maybe even Michelle's relationship with her BFF. Michelle knows Tombo doesn't want to be bad ... but is there any way to make him good?