Black Silk Handkerchief — D. L. Birchfield

In this novel by D. L. Birchfield, a hard-luck Oklahoma Choctaw lawyer, Hom-Astubby, decides that doing things on Indian time just isn't compatible with practicing law. When he tries his hand at becoming an outdoor photographer instead, Hom-Astubby is being driven nearly crazy by a curious problem he never expected to encounter - having constant good luck.
Hom-Astubby fears that his unbridled good fortune has come to an end, though, when he befriends a huge abandoned dog while on vacation in southwestern Colorado and then suddenly finds himself at the center of the biggest manhunt and the biggest media event in that state's history. Hunted by Colorado's most powerful cop, with whose girlfriend Hom-Astubby has become infatuated, he can only hope that his luck hasn't run out altogether as he plays detective in a baffling murder.
Hom-Astubby seeks the help of former girlfriends he hasn't seen for years - who aren't exactly waiting by the phone for him to call - and even puts his fate in the hands of a Navajo-Comanche bull rider, whose rodeo career didn't last as long as it had taken him to flunk out of barber college. Hom-Astubby races the clock to solve this murder and keep himself from being arrested as its perpetrator.