We are going to admit that we don't know about dogs very much, especially GREEN dogs. But we have a feeling this might happen more in March? This would've been perfect on St. Patrick's Day. It's a litter of eight nursing puppies, and one of them is GREEN. The rest are either black, or white like the mother. The good news is there is no reason to be worried about this puppies health. Someone at a vet clinic said the pup's fur was most likely stained green by something called meconium in the birth sack. It'll go away after a while, and the puppy will be white.