Early saturday morning my daughter's Great Pyrenees had a litter of pups. Out of 7 puppies 3 were green. I googled it and it seems to happen rarely. The green is biliverdin, the same thing that makes bile green and makes old bruises green colored. The green puppies seem to be perfectly healthy. The color has already started fading. Here is a picture of the little guy the kids are calling Yoda next to one of his solid white brothers.