Greenopia, an online directory that educates consumers on sustainable purchasing, updated its independent "green" ratings of nearly 30 petfood brands sold in the United States.

Greenopia gave its highest rating, a Four-Green-Leaf Award, to just four of the petfood brands rated: Karma of Natura Pet Products, The Honest Kitchen, Wenaewe and Raw Advantage. The second-highest, three-leaf-rating went to eight petfood brands: Dr. Harvey's, Newman's Own Organics, Petguard, Champion, Castor & Pollox, Back to Basics, Wellness and Dogswell.

"It seems that petfood recalls are happening more and more frequently," said Gay Browne, Greenopia's founder. “In our analysis, we tried to combine the food’s environmental attributes with an assessment of its ingredients to find not only safest foods for your pet, but also ones that are better for the planet.”

Greenopia collected data from manufacturers and independent sources about each brand's ingredients, packaging, sustainability reporting, supply chain, animal testing policies and green building design, awarding additional points to companies that adopted environmental initiatives. The green petfood ratings are available for free, online.