From 1844 to sometime around 1855, the land the hospital sits on had been handed down to Peter Brenner, who sold or handed that part down to his son, John P. Brenner who kept it until about 1905 when he kept part of it for himself and either sold or handed it down to his son, John W. Brenner. John W. was a dairy farmer who provided dairy products for the area as well as grew his own feed for the cows. At the age of 57, John W. sold the dairy barn and out buildings to Dr. Tom Eagle in 1946, who had the intent to start an animal hospital, where the building would serve the business well until it was demolished in 2014 for the current hospital. Doctor's T. Noyes and Barrow's would take over in the early 60's. In the mid-70's Dr. Barrows would leave and start his own place in Platte Woods in a home formerly owned by Cook. Cook was the president of the Cook paint company. Dr. Barrow's since retired and his building was re built in 2016. Jim Sparks started at Eagle as a 15 year old kennel assistant in 1980 and his partner, Dr. Silvius also started as a kennel assistant at Eagle in the late 80's.
The Eagle Animal Hospital is the oldest continuously operating business north of the river at the same location. The second is Red X which began in 1948. Officially, the oldest business is the Filger Oil, Company that began in the 1930's. Although the business name: Filger Oil has remained the same, it has occupied several different locations in Riverside.