Teacher's pet

"When T.D. adds Martha's name to the substitute teacher list at Wagstaff Elementary, not even he expects a talking dog to actually fill in for Mrs. Clusky. Never one to ignore the call of duty, Martha takes the class under her wing-- er, paw-- but Helen's not sure their friendship survive Martha's teaching style. [And], is it cheating if a Spanish-speaking dog helps you with your homework? Fun word activities included!"--Page 4 of cover.