Melissa Cleary Dog Lover's Mystery Series 10 out of 11 total. Priced at about 80% of total Amazon in similar condition. Titles included:

Dog Collar Crime

Hounded to Death

Skull and Dog Bones

First Pedigree Murder

Dead and Buried

The Maltese Puppy

Murder Most Beastly

Old Dogs

And Your Little Dog, Too

In the Doghouse