IDIOM					MEANING
that dog won't hunt			that idea won't work
working like a dog			working very hard
a three-dog night			a very cold night
a dog-and-pony show			a fancy sales pitch
dog paddle				swim like a dog
raining cats and dogs			raining really hard
scaredy-cat				shy or timid person
fat cat					someone who is rich or powerful
pussyfooting around			hesitating to do something
let the cat out of the bag		tell a secret
catnap					short nap
as quiet as a mouse			silent	
rug rats				young children
rabbit food				salad or raw vegetables
he sang like a canary			he told secrets

  Jill took a catnap before going to practice.

  Jack can dog paddle, but he can't really swim.

  It's raining cats and dogs and now we can't have a picnic.