A German Shepherd in North Carolina has given birth to a bright green puppy. The green pup, appropriately named "Hulk," was the fourth in a litter of eight -- and the only one that came out green. "I started freaking out," says Shana Stamey, the dogs' owner. "But everybody was healthy. She's done really good. She's a good mom." Veterinarians say the phenomenon -- which is extremely rare -- sometimes occurs when an unborn dog poops in its mother's womb. "That tends to stain them," says vet Suzanne Cianciulli.