Celebrate National Pet Month with this collection of adorable pets that are as happy as they can be. From grinning guinea pigs to smiling cats, all of these pets are seriously cheery. The month of May is dedicated to sharing just how special animals are and the benefits of taking care of pets. Giving your favorite friend a cuddle lowers blood pressure and promotes good overall health — and shows your pet that you think he's special too. Click through for some instant animal love.