Honour And Defend by Lynette Eason

A PERILOUS REUNION 

Framed for a crime he didn't commit, Lee Earnshaw is two weeks out of prison when an ex–con tries to kill him and his former love, K–9 rookie cop Ellen Foxcroft. Recognising their attacker as a man he met in prison, Lee knows he must be the intended target. But is the shooter settling a score, or does Lee have something he wants? Determined to start over, training puppies and maybe getting a second chance with Ellen, Lee vows to keep both of them safe. But as they investigate together, Ellen's golden retriever partner at their side, they find themselves dead center in a killer's crosshairs. 

Rookie K–9 Unit: These lawmen solve the toughest cases with the help of their brave canine partners