Life Is a Circus, Charlie Brown

Snoopy is lying on top of his doghouse when he hears music. He follows the music and finds a circus unloading. Among other animals, he sees three poodles, and immediately latches onto the white one (whom the audience later learns is named ''Fifi''). He follows her to the entrance of the big top with his tongue hanging out and his pupils shaped like hearts, then stops. Polly, the dog's trainer, sees Snoopy and pulls him inside.