If I can fasten but one cup upon him,
With that which he hath drunk to-night already,
He’ll be as full of quarrel and offence
As my young mistress’ dog.
– William Shakespeare
Othello, Act 2, Scene 3. In an aside Iago reveals to the audience his scheme to get Cassio drunk and rowdy, by persuading him to drink more wine on top of what he has had already. He is hoping that Cassio will get into a fight and get himself in trouble with Othello. Iago uses a very apt animal simile, because Cassio will later become like a dog when animal passion overpowers his reason and he becomes involved in a drunken brawl.