Sit, Stay, Slay — V.M. Burns

When her best friend Dixie is suspected of killing a dog show judge, Lilly must bring one sick puppy to heel . . .
 
Tennessee transplant Lilly Echosby has two great loves: dogs and mysteries. So naturally she's named her poodles Aggie, after Agatha Christie, and Rex, for Rex Stout. Now that she has two dogs to manage, it makes sense to enter Aggie in an obedience competition -- especially since her instructor is Lilly's gal pal, Scarlet "Dixie" Jefferson.
 
But when one of the judges for the competition turns out to be Dixie's high school rival, the dog trainer gets hot under the collar. When the woman is found strangled, Dixie becomes the number one suspect. With the help of the other dog club members, Lilly must find the real killer -- before the next judge Dixie tangles with throws the book at her . . .