Sentinel whose call name at the track was "Rio" is a very handsome boy who we all admired. He is a classically gorgeous greyhound but also a classy boy. He is relaxed, has good eye contact, is curious and alert. He is playful but not pushy.  The volunteers described him as "super handsome and sweet."  He walks OK on leash.  Rio is 2 years old and cat workable in that he could be corrected and directed away from the cat.