Coat Colour Inheritance Charts of the Collie

Taken from the book THE COLLIE - A VETERINARY REFERENCE FOR THE PROFESSIONAL BREEDER - Dr. Sharon Vanderlip, USA, Collie Breeder of Rainshade Collies .

Parents		Progeny
Sable ayaymm	Sable ayaymm	Sable ayaymm 100%
Sable ayaymm	Sable ayatmm	Sable ayaymm 50%	Sable ayatmm 50%
Sable ayatmm	Sable ayatmm	Sable ayatmm 50%	Sable ayaymm 25%	Tricolor atatmm 25%
Sable ayaymm	Tricolor atatmm	Sable ayatmm 100%
Sable ayatmm	Tricolor atatmm	Sable ayatmm 50%	Tricolor atatmm 50%
Sable ayaymm	Blue-merle atatMm	Sable-merle ayatMm 50%	Sable ayatmm 50%
Sable ayatmm	Blue-merle atatMm	Sable ayatmm 25%	Sable-merle ayatMm 25%	Blue-merle atatMm 25%	Tricolor atatmm 25%
Sable ayaymm	Sable-merle ayayMm	Sable ayaymm 50%	Sable-merle ayayMm 50%
Sable ayaymm	Sable-merle ayatMm	Sable-merle ayayMm 25%	Sable-merle ayatMm 25%	Sable ayaymm 25%	Sable ayatmm 25%
Sable ayatmm	Sable-merle ayayMm	Sable-merle ayayMm 25%	Sable-merle ayatMm 25%	Sable ayatmm 25%	Sable ayaymm 25%
Sable ayatmm	Sable-merle ayatMm
		Sable-merle ayayMm 12,5%	Sable-merle ayatMm 12,5%	Tricolor atatmm 12,5%
		Sable ayaymm 12,5%	Sable ayatmm 12,5%	Blue-merle atatMm 12,5%
Tricolor atatmm	Tricolor atatmm	Tricolor atatmm 100%
Tricolor atatmm	Blue-merle atatMm	Blue-merle atatMm 50%	Tricolor atatmm 50%
Tricolor atatmm	Sable-merle ayayMm	Sable-merle ayatMm 50%	Sable ayatmm 50%
Tricolor atatmm	Sable-merle ayatMm	Sable-merle ayatMm 25%	Sable ayatmm 50% 25%	Tricolor atatmm 25%	Blue-merle atatMm 25%
Blue-merle atatMm	Blue-merle atatMm	White-merle atatMM 25%	Tricolor atatmm 25%	Blue-merle atatMm 50%
Sable-merle ayayMm	Sable-merle ayayMm	White-merle ayayMM 25%	Sable-merle ayayMm 50%	Sable ayaymm 25%
Sable-merle ayayMm	Sable-merle ayatMm
		White-merle ayayMM	White-merle ayatMM	Sable ayaymm
		Sable-merle ayayMm	Sable-merle ayatMm	Sable ayatmm
Sable-merle ayatMm	Sable-merle ayatMm
		White-merle ayatMM 12,5%	White-merle atatMM 6,25%	White-merle ayayMM 6,25%
		Sable-merle ayatMm 25%	Sable-merle ayayMm 12,5%	Blue-merle atatMm 12.5%
		Tricolor atatmm 6,25%	Sable ayaymm 6,25%	Sable ayatmm 12,5%
Sable-merle ayayMm	Blue-merle atatMm	White-merle ayatMM 25%	Sable-merle ayatMm 50%	Sable ayatmm 25%
Sable-merle ayatMm	Blue-merle atatMm
		White-merle ayatMM 12.5%	White-merle atatMM 12,5%	Tricolor atatmm 12,5%
		Sable-merle ayatMm 25%	Sable ayatmm 12,5%	Blue-merle atatMm 25%

The lighter highlighed colour com/binations are not allowed in Switzerland.

Merle x merle breeding produces the so-called double-merles or white-merles, they may be defective in hearing and/or vision.

Sable-merles or darksable-merles can sometimes be very difficult to identify, usually the merling can be seen on puppies only. A knowledge of the parents genytypes is required. To avoid a sable-merle x sable-merle mating, thie breeding of sable-merles is not allowed as well. 

White Collies are 90-99 percent all white and are homozygous for the white factor s^w. The head of the White Collie is coloured according to its genotype (sable, tricolour, blue-merle). As the collie is a British breed, England is responsible for Collie standard. In the actual standard, the colour white is not a recognised Collie colour and may lead to a disqualification on shows and selections. In the USA the White Collie is permitted to be exhibited, the colour white is an additional colour in the US standard.

The White Collie is a healthy dog as sable and tricolours, and is on its way to win more and more popularity in Europe. The White Collie has noting to do with a double-merle which may be defective.

Parents		Progeny
white swsw	white swsw	white 100% swsw
white-faktoriert sisw	white-faktoriert sisw	white 25% swsw	white factored 50% sisw	not white factored 25% sisi
white factored sisw	white swsw	white 50% swsw	white factored 50% sisw
white swsw	not white factored sisi	white factored 100% sisw
white factored 100% sisw	not white factored sisi	white factored 50% sisw	not white factored 50% sisi
not white factored sisi	not white factored sisi	not white factored 100% sisi