An alley cat is the same as a stray cat or a cat that has no home.
“I began to feed the alley cat and now it comes to my house every day.”
As Weak as a Kitten
When you are ill, you can say you feel as weak as a kitten. Just think how weak a kitten is!
“I have a really bad cold and feel as weak as a kitten!”
A thief that breaks into a house and steals things.
“A cat burglar broke into our apartment and stole our television, I’m really sad today.”