The Flying Red Horse — Frances Crane

The Abbotts travel to Texas and their dachshund finds a dead body in a mystery starring “one of the more interesting married teams of detectives” (Thrilling Detective).
 
When Jean Abbott arrives in Dallas to join her private investigator husband, Pat, she's disappointed to discover that their dog, Pancho, is not welcome at the hotel. She finds a temporary place for him with the daughter of Pat's wealthy client, oilman Iles Dollahan. Then little Pancho comes across a corpse on the secretive family's property -- and the Dollahans put the pressure on to presume the death an accident so that it will be swiftly forgotten. With no obvious suspects to suggest murder, that could be a possibility -- until Pat finds a will that changes everything . . .
 
Praise for the Pat and Jean Abbott Mysteries
“Lively and exciting.” -- The New York Times
 
“Well-plotted and mystifying.” -- Saturday Review
 
“Quite good.” -- The Miami News