Tracker by James Rollins is a Sigma Force novel that I gave four stars. It is a fast book to read with suspense-filled moments.
Tucker worked with his hunting dog Kane. When he was wearing camera gear, he saw through the shepherd's eyes. "The dog was as much an extension of his senses as he was a partner."
"The army had trained him to maintain such diligence, to watch for the unusual amid the ordinary. When he'd been a captain with the army rangers, he and his partner had served as the unit's trackers through two tours in Afghanistan-for search-and-rescue operations, for extraction, for hunting down targets of acquistion."
I received a complimentary copy in an Amazon promotion. That did not change my opinion for this review.
Link to purchase: https://www.amazon.com/Tracker-Short-Story-Exclusive-Sigma-ebook/dp/B00851M33S