Dog Colour Genetics Calculator
Predict the coat color probabilities based on E, B, and D Loci.
Sire (Father)
EE (Dominant Black)
Ee (Carries Recessive Red)
ee (Recessive Red/Yellow)
BB (Dominant Black)
Bb (Carries Brown)
bb (Brown/Chocolate)
DD (Full Color)
Dd (Carries Dilute)
dd (Dilute – Blue/Lilac)
Dam (Mother)
EE (Dominant Black)
Ee (Carries Recessive Red)
ee (Recessive Red/Yellow)
BB (Dominant Black)
Bb (Carries Brown)
bb (Brown/Chocolate)
DD (Full Color)
Dd (Carries Dilute)
dd (Dilute – Blue/Lilac)
Predicted Phenotypes:
Understanding Dog Coat Color Genetics
Predicting the color of a litter requires understanding how different genes (loci) interact. This calculator focuses on the three primary loci that determine the base color and intensity of a dog's coat.
The E Locus (Extension): This acts as a master switch. If a dog is "ee", it will be yellow, red, or cream, regardless of what the other genes say. This is known as recessive red.
The B Locus (Brown): This determines if the black pigment stays black (B) or turns brown/chocolate (bb).
The D Locus (Dilute): This affects the intensity of the color. A dog with "dd" will have a diluted coat: Black becomes Blue (Grey), and Chocolate becomes Isabella (Lilac/Silver).
Example Scenarios
If you breed two Ee Bb Dd dogs (Black dogs carrying all recessive traits), the mathematical probability allows for almost every color to appear in the litter, including rare Isabella or Blue puppies.
- Black: Needs at least one 'E', one 'B', and one 'D'.
- Chocolate: Needs at least one 'E', but 'bb' and at least one 'D'.
- Blue: Needs at least one 'E' and one 'B', but 'dd'.
- Isabella: Needs at least one 'E', but must be 'bb' and 'dd'.
- Yellow/Red: Any dog with 'ee' genotype.