Xtreme Behavior by Em Petrova

This special operative and a K-9 handler must work in close proximity to solve a crime—and whether they kill each other or wind up in bed is anyone’s guess.
After a string of deaths are linked to a man locked up for another crime, Special Operative Alix Broshears and his team are racing against the clock to stop him before another person dies. Bringing in the gorgeous handler from a local K-9 unit makes sense—unless you ask Broshears’ libido. When it comes to the intelligent woman who thinks on her feet, his control is tested every damn minute.
Vivian Valentine is up for the challenge of joining the team on yet another mission with her K-9 partner, Zack. She’s also determined to prove her worth to a certain special operative who takes arguing with her seriously.
Sure, they hate each other. They’re also friends.
And there might have been one encounter in a closet, but they don’t discuss that.
Despite their strained ties, when Broshears learns Vivian’s in peril, the race is on to save her. Nothing can keep him from holding back his wrath against their enemies…or his feelings for the woman he’s determined to rescue.