The cat/bird/worm trap

Once upon a time there was a dog and he decided to make a trap for cats it worked well but one day there was a cat with a sheild and sword  and the dog ended up dying and the cat use the trap for the birds but one day there was a bird with a sheild and sword  and the cat ended up dying and the bird use the trap for the worms and the same thing kept hapenning on and on again