Crookshanks

Ron is angry because he feels Crookshanks is responsible for Scabbers' disappearance, while Hermione fiercely maintains that Crookshanks is innocent.

East Fairmont 24, Elkins 7: Ian Crookshanks rushed for two touchdowns and threw for a score as the Bees (7-1) notched their seventh straight victory.

Ron had no proof that Hermione's cat Crookshanks ate his pet rat Scabbers, yet even if he did have concrete evidence, it's not like Hermione has any control over the actions of her pet.