A barking dog never bites.

You can’t teach an old dog new tricks.

Die like a dog.

A dog in a kennel barks at his fleas; a dog hunting does not notice them.

It’s a dog eat dog world.

Let the big dog eat.

Who loves me will love my dog.

A good dog deserves a good bone.

Love me, love my dog.

A dog is a man’s best friend.