If you follow the yellow
squares back..you will see a sable in the last generation..As it goes forward,
you will see there has been tan points produced.
Because there has been
tan points from the sable . The sable gene is now gone..
This dog cannot produce
sable, unless he is bred to a sable and if he is carrying for tan points.
This is how easy you can
lose sable in a pedigree.