SUMMER DREAMS Diorama Of Massacre In Trove Of Artifacts At Cherry Valley Site Local Museums Are Full Of Surprises By LIBBY CUDMORE • Special to www.AllOTSEGO.com CHERRY VALLEY – In the homesteads of Cherry Valley, even the dogs had to help out with the chores. “We have a dog treadmill from the 1893 Sears & Roebuck catalogue,” said Barbara Bill, director of the Cherry Valley Museum. “It was attached to a butter churn, and you hung a bone up front…