Each plan automatically renews at its original interval (monthly, six months, or yearly), and you can cancel your renewal at any time. But if you really don't like the idea of commitments, rest assured that you can simply "bark in" to customer service and they will cancel your subscription immediately, regardless of your renewal date. They'll also issue a refund for any unused months if you are on the pre-paid plan. I confirmed this via chat, and it's also where I picked up all this doggie-lingo.
We started this whole operation to serve the people who are just like us: nuts about dogs. We're "our dogs have more elaborate parties then we do" obsessed. We eat ramen noodles while our dogs dine on organic grass-fed beef. We are disappointed when our dogs don't follow us into the bathroom. Our families think it's cause for concern. But who cares about them? We're here for you and your dog. We've never met your dog, but we know we love them.