Classic Poem

So have I seen ere this a silly fly
With mastiff dog in summer's heat to play,
Sometimes to sting him in his nose or eye,
Sometimes about his grisly jaws to stay,
And buzzing round about his ears to fly,
He snaps in vain, for still she whips away,
And oft so long she dallies in this sort,
Till one snap comes and marreth all her sport.