[4][5] Dallin converted to Unitarianism and initially turned down the offer to sculpt the angel Moroni for the spire of the LDS Church's Salt Lake Temple.

[8] In Boston, Dallin became a colleague of Augustus St. Gaudens and a close friend of painters John Singer Sargent and William McGregor Paxton with whom he played baseball for the St. Botolph Club.

He taught for a year at the Drexel Institute in Philadelphia, Pennsylvania, while completing his Sir Isaac Newton (1895) for the Library of Congress.

Together they traveled to Neuilly outside of Paris to sketch the animals and cast of Buffalo Bill Cody's Wild West Show at their encampment.

[14] Dallin created four prominent equestrian sculptures of indigenous people: A Signal of Peace, or The Welcome (1890); The Medicine Man, or The Warning (1899); Protest of the Sioux, or The Defiance (1904); and Appeal to the Great Spirit (1908).

The full-size staff version of Protest of the Sioux was exhibited at the 1904 Louisiana Purchase Exposition, where it won a gold medal.

The mounted brave defiantly shaking his fist at an enemy was never cast as a full-size bronze and survives only in statuette form.

In 1929, a full-sized bronze version of Appeal to the Great Spirit—personally overseen and approved by Dallin— was installed in Muncie, Indiana, at the intersection of Walnut and Granville Streets, and is considered by many residents to be a symbol of their city.

Benefactors of the city would later add to their Dallin portfolio through the purchase of the Passing of the Buffalo sculpture, which had been commissioned by Geraldine R. Dodge.

[23] The Taylor-Dallin House in Arlington where Dallin and his family lived is a privately owned residence and has not been listed on the National Register of Historic Places.

[24] The Beach Boys based the logo for their Brother Records label on Dallin's sculpture, Appeal to the Great Spirit.