Animal Attraction by Katee Robert

A private investigator might not be as glamorous as Brooklyn James had expected, but it pays the bills. Or at least it used to. In dire financial straits, she no longer has the luxury of saying no to jobs if she wants to pay her bills—which is how she ends up in a tree, spying on a billionaire who’s accused of dognapping. Not her finest moment.
Levi Turnbull made his fortune by creating tech that melds exercise with video games. It sounded great at the time, but now he’s got more money than he knows what to do with and he’s bored out of his mind waiting for the next game to launch. When he realizes a neighbor has been neglecting his dog, he takes matters into his own hands—by taking the dog. If he’s been trolling the neighbor ever since with hilarious fliers around the area… Well, he’s only human. When he finds a pretty redhead trespassing on his property in search of the missing dog, he sees the ultimate distraction until the launch.
Brooklyn initially agrees to a date in order to get close enough to Levi to find evidence of his dognapping—but that motivation gets complicated when they end up in bed together. She’s unable to resist his charm, and as they grow closer, Brooklyn can’t avoid the truth—not only did Levi steal a million dollar dog…he’s in danger of stealing her heart, too.