yapper

A person's mouth, especially one that gossips or talks too much.

Shut your yapper or I'll shut it for you!

One who yaps.

If you want your pack to be a deterrent against burglars or muggers, forget about small dogs, yappers though they be. Focus on the larger breeds, particularly working stock with strong instinctual drives.

I have to admit I would have a lot more tolerance for cell phone yappers on my one-hour train ride to and from work if they were actually learning — instead of yelling […]

Ellipsis of yapper dog

If you’ve got a yapper dog, take him somewhere else.