May is National Bike Month, and the roadways where I take my dog North on walkies are filled with wheels. It's pretty common to see cyclists running their dogs alongside their bicycle with a long leash, but it's critical to pratice safe biking and ensure your pup is big and strong enough to keep up. For those with four long legs, there's a whole world of expert toys and gear like this PetEgo Walky Dog Bicycle Leash ($36), which keeps doggie at a safe distance from your bike. Would you rock a gadget like this while running?