Earth Day Archive Posted on April 22, 2011 Happy Earth Day! Check out these previous posts for ideas on things you can do to make your pets more earth-friendly. A big round-up of DIY projects—beds from suitcases, doggy rain coats from people rain coats, doggy sweaters from socks. Sweet! Ways to limit your pets’ environmental impact. The 30 Day Green Cat Challenge from an awesome website Green Little Cat.