Wag!, the first app to provide dog owners with instant access to quality dog walkers, is announcing its launch in 16 new cities nationwide after successful launches in major markets such as Los Angeles, San Francisco, and New York. Its launch in Philadelphia is part of the company’s plan for continued growth across the nation. And whether it’s doing doggie yoga on the pier or playing a game of fetch at Schuylkill River Park, there is really no limit to the way owners in Philly can bond with their dogs. The City of Brotherly Love also loves pets which is why Wag! is a perfect fit for Philadelphians. In fact, Wag! is so…