The circus is coming. The circus is coming! This time, though, it is a canine comic circus. What could be more fun! Johnny Peers and The Muttville Comix are making a third visit to The Ridgefield Playhouse for Movies and the Performing Arts. Part of the Pepsi Children's Series, the delightful show is underwritten by South Salem Animal Hospital and Noah's Ark Animal Hospital in Danbury. Johnny Peer's menagerie of mongrels has performed with Ringling Bros. Barnum and Bailey Circus and with the Big Apple Circus--they jump rope, climb ladders and play with Johnny, he being their fall guy. They are a mix to be sure--there is a basset, some greyhounds, a bunch of terrier mixes and a Chihuahua. They all, including Johnny, present flawless comic timing.