Annette Patton, Stanislaus Animal Services director, on why people should come forward for the free pit bull and Chihuahua spay/neuter program at Animal Services to pick up a couple of poodle mixes Thursday. “I only go up and down Highway 99 Up to 40% of shelter dogs are pit bulls or pit bull mixes, and after a while While you probably won’t see a miniature poodle or a Chihuahua being used anytime soon, pit bulls are well-built and intelligent and suited for the kinds of situations .