show welcomed mutts into the mix. how did they do? here's jeanne moos. >> reporter: finally mutts are back at westminster. at least in the agility competition that takes place before the main event. but how do you separate the purebreds from the mutts? >> mutt or no mutt? >> neither is. >> mutt or no mutt? >> not a mutt. >> mutt or no mutt? >> the mere question was enough to offend this dog. >> out of 225 dogs competing on the agility course were 15 were mutts. >> this is a mutt. >> meet sadie from connecticut. although some went around jumps or seems to be slow running the weave poles. even the purebreds messed up. this one needed a do over but