[WP]Harry can make animals go insane with his magic. If he feels any negative emotions, nearby animals attack the source. The animals never hurt Harry. (This is tied to the House of Black's insanity. Harry can cause insanity in animals.)

Ripper ended up attacking the Dursleys. Birds and pets attack Dudley's gang when they try to hunt Harry.

In Hogwarts, Harry can make owls attack Draco