The City of Manteca is working to reduce the chances of another dog meeting the same fate as Hershey. By all accounts, Hershey was a lovable year-old German Shepherd mix that had been at the Manteca Animal Shelter. Hershey, after three months, developed kennel stress — a term used for when dogs encounter a state of mental or emotional strain and tension during a kennel stay. In Hershey’s case, it manifested by him growling and developing other aggressive behavior.