These dogs belonged to a Mr. L. Allen Shuter (no pun intended). These are some very famous flat-coated retrievers, and they also appear in some of the early golden retriever pedigrees. The flat-coats of this time resembled what I would call working-type golden retrievers. The only obvious difference is that these dogs were black.
These images come from a Country Life Illustrated article that appeared on 10 May 1902:







