Retribution. Dryden Universe, #6

Tensions simmer on a world where Humans still blame the Yrmaks for their defeat in the last war. For Celia Whitley-former head of Imperial Security and now leader of Humans First-it's the perfect place to spark another conflict. All she needs are weapons and money, and she knows how to get both. The Yrmaks who murdered her husband will pay. Imperial agent Tian Axmar wants Whitley dead-but her orders are to bring the traitor back alive.
With partner Brent Walker and the auralfang, Puss, Tian follows a trail of stolen heavy weapons that could ignite the galaxy. As they race to stop Whitley's plan from erupting into interspecies war, Tian and Brent discover her true target hits far closer to home. To stop her, they'll need every scrap of their cyborg strength-and the courage to face the cruelest vengeance of all. This novel is the third story starring Brent Walker and Tian Axmar.
Like the other Dryden books, it's a space opera full of action and adventure. And of course it includes Puss. If you'd like to read a bit more about Princess Amira and Admiral Ul-Mellor, take a look at A Matter of Trust. How Tian and Brent got together is the story in Eye of the Mother. And we first meet Puss in For the Greater Good.