“We conclude that Hurn, acting as a private animal-welfare officer, may not assert
qualified immunity as a defense against suit in her personal capacity because there is no history
of immunity for animal-welfare officers and allowing her to assert qualified immunity is not
consistent with the purpose of 42 U.S.C. § 1983.
However, Walsh and Nicholson, acting both as
private animal-welfare officers and as specially-commissioned police officers of the City of
Chattanooga, may assert qualified immunity as a defense against suit in their personal capacities.“