There are 3 books in the A Breed Apart series. The newest book is Beowulf which came out in 2014.

1
Trinity

Book cover of Trinity
A year ago in Afghanistan, Green Beret Heath Daniel’s career was destroyed. Along with his faith. Now he and his military war dog, Trinity, train other dogs and their handlers. Though his passion is to be back in action, the medical discharge has forced Heath—and Trinity—to the sidelines. Military intelligence…
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2
Talon

Book cover of Talon
Aspen Courtland wants her brother back—dead or alive—but only his traumatized combat tracking dog, Talon, knows where to look, if he can muster the courage for one more mission. (suspense)

3
Beowulf

Book cover of Beowulf

Beowulf—a hulky, brindle-coated bullmastiff—is the only “boy” for Timbrel Hogan. And she has a history to remind her why. But when Timbrel, a handler at A Breed Apart, embarks on a mission to detect WMDs in Afghanistan, she reunites with Tony “Candyman” VanAllen and her no-other-man philosophy is challenged. While…