The blue eyes actually show up in almost all young puppies because of the amount of 'true black' in their coats. It's not until the pups have begun to break that the "green eye shine rule" can be applied with any degree of accuracy. The general consensus is that if the pup is still showing cool tones (green/blue-green) at 8 months, the coat is indeed a true silk. Cotton coats will show red or amber (warmer) tones, and a mixed coat is often somewhere in between (yellow-green.) But the blue eyes most younger puppies exhibit really can't tell you much about the puppy's coat at all
