Taking a bull by its horns would be the most direct but also the most dangerous way to try to compete with such an animal. When we use the phrase in everyday talk, we mean that the person we are talking about tackles their problems directly and is not worried about any risks involved.
(USA) It means until the very last possible moment or until every possibility is exausted:
You boys always stay until the last dog is shotI will stay until the last dog is shot to complete this project by deadline
(Expression my mom who was born in 1917 in Wisconson always used.)
To 'wag the dog' means to purposely divert attention from what would otherwise be of greater importance, to something else of lesser significance. By doing so, the lesser-significant event is catapulted into the limelight, drowning proper attention to what was originally the more important issue.The expression comes from the saying that 'a dog is smarter than its tail', but if the tail were smarter, then the tail would 'wag the dog'. The expression 'wag the dog' was elaborately used as theme of the movie. 'Wag the Dog', a 1997 film starring Robert de Niro and Dustin Hoffman, produced and directed by Barry Levinson.
Meaning you will not get something when you want it or someone doesn't want something for you. say you are selling an item and some one doesn't want it. they might say 'I'll buy it when pigs fly'. it just means you will never get someone to say yes to you when you ask for something.
People whose behaviour is strictly controlled go over the top when the authority is not around, which is why most teenagers have parties when their parents have gone on holiday. The parents are the scary authority figures, but the cat's away and the kids are the mice partying and enjoying their freedom.