the human and his pet Beast

When a solar storm scrapes by warthog mutated all animals in the world to become monstrous beings, that their called beasts. these beast's have rabid and aggressive nature. Everything changed, pets turned into beast and killed their owners. All world government decided to eliminate all beast from their nation so they can study them. but what would happen if a boy and his pet rabbit become the only known human to be living with a beast with out becoming a chew toy for it