Dog pile. Not the kind that has to be scooped from the yard. The good kind, a pile of dogs! Top of the pile is rat terrier Anya, age 15, who has a mellow disposition and is tolerating the 2 youngsters well. An occasional growl lets them know she does not want to play.Judy, rat terrier/chihuahua mix, white with black, age 2. New arrival Penny, chihuahua mix, cream with brown, age 1. Judy and Penny are becoming friends, they run and wrestle then collapse into sleep. Penny learned to use the doggie door in 3 days.