R1 ZOO-P2

Did you ever get the feeling your dog was ... ... you?

New ... suggests maybe he was!

Dogs make "..." noises scientists think is doggie laughter.

Dogs make "huffing" noises ... think is doggie laughter.

They also make it when ... a toy around by themselves.

Patricia Simonet, a Spokane, Washington, psychologist, first ...the sound.

She recorded ... dog sounds on a special machine that also graphs noise.

When she played the sounds back to other dogs, they also ... positively. 

Does laughter mean ... ... ... ?

Do great ....have a sense of humor?