William De La Montagne Cary, 1840 to 1922, oil on canvas painting depicting a girl giving commands to a dog, 1867. Signed and dated lower right. Framed. William de la Montagne Cary was an American artist. Having a sharp eye for the unusual, he nevertheless executed his canvases with such careful attention to realistic detail that they came to be regarded as important historical documents. Perhaps his most important contribution was his portrayal of Plains Indian customs and ceremonies. Antique American Paintings For Collectors.