Mr. Tarr operated a souvenir photo postcard business called the Dream Studio on Surf Avenue at West 6th Street below the Pike's Peak Roller Coaster. The studio had numerous full size props including an early automobile and a Wright Brothers style airplane. We have many of his images in our archive and the little white shaggy dog is a constant in these photos. Many of the studios had silly toy props that were used to loosen up the subjects as their photo was taken.
The Dream Studio was destroyed in the 1911 Dreamland fire but reopened shortly after with a new painted backdrop that depicted the burned out ruins of the park. The enclosed photo shows the Dream Studio below the Pike's Peak Railway (circled). The entrance to Dreamland is at right and the Iron Tower is behind Pike's.
Attached is another photo of the little white dog!