- You know, an egg is one of nature's wonders. The best natural source of complete protein. Everybody loves eggs, even dogs, and now every dog can have egg in its diet because there's new Gaines-burgers with egg. The moist, meaty taste dogs love. Plus a quarter of a real egg in a burger. Why not give your dog a taste he'll love and all the goodness of real egg? Give him new Gaines-burgers today.