Scheffler Family & dog

This is one of a series of photographs in an album that I inherited from my great-aunt, Edna Lucille Fuller Johnson (1903 - 1988.) I believe the photos were taken by her father, Frederick L. Fuller (1871 – c.1915.) As Mr. Fuller died when she was still a child, I have very few clues to his life. Most of the photos are of rivers in New Jersey and other states. I think his interest in rivers related to hydro-electric plants that he may have helped to establish. There are also family photos that probably record the members of his grandfather's household prior to 1903. The Scheffler family lived on Jasper Street, Paterson, New Jersey. Unfortunately, unlike the river photos, there are no names recorded in the album for family members.

Fred Fuller can only be found on two federal census reports. The first listing is on the 1880 census of Paterson, Passaic, New Jersey, where he is a nine year old living with his grandfather, Theodore Scheffler.

The second listing is on the census of 1900 for Frederick and his wife Nana or Nannie Blackley (1879 - 1838.) In that year, he is listed as an electrician, living in Essex, East Orange, New Jersey.

According to family lore, Fred met his future wife, Nana Blackley, when he went to Franklin, North Carolina to set up an electric plant.
This photo may be Fred Fuller with a Scheffler lady and a well-trained dog.

Names of the people?