In the absence of a controlling entity, subordinates will take advantage of circumstances.

Alternative form of look like something the cat dragged in

Alternative form of dogs have masters, cats have staff

(humorous) A domesticated canine will always aim to please and display loyalty to its owner, whereas a domesticated feline will always seek to be served and obeyed.

(originally US) A problem generally has more than one solution; there is more than one way to achieve a goal.

In order to achieve something, it is inevitable and necessary that some sacrifices must be made.

(simile) Extremely nervous.