It can be a challenge to be a pet lover and to be environmentally responsible (a case in point being kitty litter). When it comes to recycling pet-food bags, it often comes down to what the bag is made of, and what your curbside hauler, or a local drop-off program, accepts. We consulted Diane Herndon, senior manager of sustainability for Purina, to get some input on whether pet food bags are recyclable. She says the packaging used for dry pet food is made up of a variety of materials, including polypropylene, paperboard, and mixed plastics (polyester and polyethylene).