Merle And Double Merle Sheltie Coat Color

What causes the lovely pattern for this sheltie is not a color gene but a modifier to any base color that a Sheltie may inherit.

A Bi-Blue Differs From Blue Merle Sheltie

A bi-blue is a bi-black sheltie with an addition of the merle gene which provides the mottling. There are no tan markings. The blue merle on the other hand, is a tri-color sheltie with the merle gene. The usual tan points over the eyes, the sides of the muzzle and the legs are still noticeable. Check out the di…