There are many ways to deal with the problem of plastic grocery bags. You can carry your groceries in cloth totes instead, recycle the bags, or get crafty with them. But one of the main ways that people reuse plastic bags is as dog-poo scoopers.
While I can understand the desire to put some plastic between you and your dog's droppings, you're still adding more plastic bags to the landfills every time your dog has to go. Thankfully, I've found an alternative. These Business Bags ($5.95 for 40) are made from corn-based plastic, so they will biodegrade in just 45 days. With these, you'll get the protection of plastic without harming the Earth. That sure beats regular plastic bags, which can take years, sometimes hundreds of years, to decompose.