Although the bag may be biodegradable, the pet waste itself is not biodegradable. Do not put it in your compost pile or yard waste bin. Put it in your trash instead.
Biodegradable bags seem like a an eco-friendly option, but in a landfill they often don't break down the way they're supposed to. The biodegradation process will only happen in an oxygen-filled (aerobic) environment. In most cases, landfills are oxygen-free (anaerobic) environments, meaning that the layers and layers of trash that are piled up in the contained space have no room for air to pass through. So what would happen to the biodegradable bag? If anything, any biodegradable plastics that would break apart in the landfill will actually emit methane, a greenhouse gas that is 23 times more potent than CO2.
Rather than biodegradable pet waste bags, we recommend using a bag that contains some recycled content.