Dog Coat Color Genetics Calculator
Coat Color Genetics Calculator
Predict your puppies' coat colors based on the sire and dam's colors. Select a breed group, choose each parent's color, and optionally note known carrier status for more precise results.
Choose a breed group to start
How coat color genetics works
Dog coat color is controlled by several genes, each with dominant and recessive alleles. The two most fundamental loci are the B locus (black vs. brown pigment) and the E locus (extension — whether pigment is expressed at all). Understanding these two genes alone explains most coat color outcomes in breeds like Labrador Retrievers.
Key color loci in dogs
| Locus | Controls | Dominant | Recessive |
|---|---|---|---|
| B (Brown) | Black vs. brown pigment | B — black pigment | b — brown/liver/chocolate |
| E (Extension) | Pigment expression | E — allows dark pigment | e — yellow/red/cream only |
| K (Dominant Black) | Solid color vs. pattern | KB — solid black | ky — allows A-locus patterns |
| A (Agouti) | Pattern type | Ay — sable/fawn | at — tan points, a — recessive black |
| D (Dilute) | Pigment intensity | D — full intensity | d — diluted (blue, lilac) |
| M (Merle) | Mottled pattern | M — merle pattern | m — solid (no merle) |
| S (Spotting) | White markings | S — solid color | sp — piebald/parti |
Based on current canine color genetics research. Nomenclature follows standard genetic conventions.
Dominant vs. recessive inheritance
A dominant allele needs only one copy to be expressed — if a dog has one B and one b, it will have black pigment (black is dominant). A recessive allele needs two copies to show — a dog must be bb to have brown/chocolate pigment. This is why two black-appearing dogs can produce chocolate puppies: both parents can be Bb (carrying one hidden copy of brown).
Common inheritance patterns
| Cross | Expected puppies | Notes |
|---|---|---|
| Black (BB) × Black (BB) | 100% Black | No recessive genes present |
| Black (Bb) × Black (Bb) | 75% Black, 25% Chocolate | Both carry chocolate |
| Black (BbEe) × Black (BbEe) | 56% Black, 19% Choc, 25% Yellow | Carry both recessives |
| Chocolate (bb) × Chocolate (bb) | 100% Chocolate | Unless both carry yellow |
| Yellow (ee) × Yellow (ee) | 100% Yellow | May differ in nose pigment |
| Sable × Sable (GSD) | ~75% Sable, possible B&T | Sable is dominant in GSDs |
| Merle × Non-merle | ~50% Merle, ~50% Solid | Safe merle cross |
Based on Mendelian inheritance ratios for two-locus models.
Why phenotype prediction has limits
This calculator uses visible coat color (phenotype) as input, not DNA test results (genotype). A black dog could be BB, Bb, or even BBee — each producing very different litter outcomes. For breeding programs where color accuracy matters, invest in a DNA color panel test. Providers like Embark, Wisdom Panel, and UC Davis VGL offer comprehensive color genotyping for $80–$200 per dog.
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Coat color genetics FAQs
1How does coat color inheritance work in dogs?
Dog coat color is determined by multiple genes, but two are most important: the B locus (brown/liver) and the E locus (extension/yellow). The B locus determines whether dark pigment is black (B) or brown (b). The E locus determines whether the dog can express dark pigment at all (E) or is restricted to yellow/red pigment (e). Both b and e are recessive, meaning a dog needs two copies to show the recessive color.
2Can two black Labs have yellow or chocolate puppies?
Yes. If both black Labrador parents carry the recessive yellow gene (Ee), about 25% of their puppies will be yellow. Similarly, if both carry the recessive chocolate gene (Bb), about 25% will be chocolate. If both carry both recessives (BbEe), the litter can include all three colors — approximately 56% black, 19% chocolate, and 25% yellow.
3What determines Golden Retriever shade?
Golden Retriever coat shade (light cream to dark red) is controlled by multiple modifier genes, making it polygenic rather than a simple dominant/recessive trait. Two gold parents can produce puppies ranging from slightly lighter to slightly darker than themselves. Breeding light to dark tends to produce medium-gold puppies with a wide shade range in the litter.
4Why is the merle gene important to understand?
Merle (M locus) creates a mottled/patchy coat pattern and is dominant — one copy produces the merle pattern. However, breeding two merle dogs together (merle × merle) can produce 'double merle' puppies (MM), which are associated with serious health problems including deafness and eye defects. Responsible breeders never cross two merle dogs.
5How accurate is this calculator?
For Labrador Retrievers, the predictions are quite accurate because Lab coat color follows well-understood Mendelian genetics at the B and E loci. For other breeds, predictions are estimates based on general dominance patterns. The tool uses phenotype (visible color) rather than genotype (DNA), so hidden carrier genes can produce unexpected results. DNA color panel testing gives definitive answers.
6What is carrier status and why does it matter?
A carrier is a dog that looks one color but carries a hidden recessive gene for another color. For example, a black Lab that is Bb carries chocolate — it looks black but can produce chocolate puppies when bred to another chocolate carrier. Knowing carrier status (through DNA testing or breeding history) dramatically improves prediction accuracy.
7Should I DNA test my breeding dogs for color?
Yes, if you are serious about predicting puppy colors or avoiding health-linked color combinations. A DNA color panel test from Embark, Wisdom Panel, or UC Davis VGL costs $80–$200 and reveals the exact genotype at all major color loci (B, E, K, A, D, M, S). This is especially important for breeds where certain color combinations carry health risks, such as double merle.