From poop bags to all-natural treats, we’ve featured a variety of subscription services here on Dog Milk. Each one has something a little bit different to offer (and may be a better fit than others depending on your needs), including PetBox. While PetBox follows the familiar monthly delivery model, it differs from similar services in that it’s the only one that allows you to pick what’s in your box! For those who opt for lengthier subscriptions, this is kinda awesome as it lets you avoid getting the same types of items over and over (you can only go through so many treats in a month, ya know?).