At method, we believe that guinea pigs should never be used as guinea pigs. That's why we never test any of our products or ingredients on animal or use animal by - products - ever. And because we love critters so much, our entire product line is also safe for use around pets. Meow. Plant-based, biodegradable ingredientsAt method, we believe that guinea pigs should never be used as guinea pigs. That's why we never test any of our products or ingredients on animal or use animal by - products - ever. And because we love critters so much, our entire product line is also safe for use around pets. Meow. Plant-based, biodegradable ingredients