Have a teen that has a little too much free time on their hands this summer? Or maybe you’re looking for a fun way to make a few extra bucks in between dropping the kids off at sports practice? Becoming a dog walker is a great option for people of all ages who want to make a little extra cash! However, just because you want to become a dog walker doesn’t mean you’ll become one overnight. There are a few things you’ll need to do before you start walking dogs in the Philadelphia area. Know the Best Places to Go Walking around the neighborhood is for amateurs. If you really…