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Built By DustySoftware studio · est. 2017

Free tool · Color Predictor

What colors will
this Frenchie litter be?

Set the genotype for the sire and dam across the nine French Bulldog coat loci and watch every predicted puppy color appear with its probability, live, as you go. Each result is labelled AKC standard or disqualification, popular colors are called out, and merle-to-merle pairings raise a double-merle health warning.

Free · no signupAKC DQ flagsCarrier odds

Set only the loci you know for each parent. Anything left on its first option is treated as not carried, so you can predict a pairing without touching all nine.

Quick start
Sire · fatherDam · mother
Coat lengthFGF5
MerlePMEL
Dilute · blueMLPH
Brown · cocoaTYRP1
Extension · mask / creamMC1R
Two cream copies give a clear cream. Mask (Em) adds a dark face.
AgoutiASIP
Only shows when the K locus allows it (non-brindle, ky/ky).
K locus · brindleCBD103
Solid (KB) hides agouti. ky/ky lets fawn / tan show.
Spotting · piedMITF
Two copies give piebald (pied) white spotting.
IntensityMFSD12
Two copies wash red / tan pigment toward cream.
Most likely color3 colors
Blue Merle

Roughly 50% of the litter · in-demand color

AKC standard 0%AKC show DQ 100%

A show-ring classification only. DQ colors are healthy, registrable pets and are accepted by many other registries.

Popular colorAKC standardAKC show DQ
Blue MerlePopularAKC show DQ

A black base broken up by a merle patchwork.

50%1 in 2
BlackAKC show DQ

A solid black coat.

37.5%
BluePopularAKC show DQ

A solid blue-grey coat: dilute black.

12.5%1 in 8

Hidden carriers

A visually standard-colored pup can still silently carry a recessive color. These are the odds a normal-looking pup is a carrier, the "testable vs. visual" gap a DNA panel resolves.

66.7%Carries blue (dilute)Chance a visually clear pup carries one hidden copy.

Predictions assume simple Mendelian inheritance across the nine coat loci. Real litters vary with modifier genes and expression. Registry status is about show standards, not a dog's health or worth.

How it works

Set the genes,
read the litter.

The predictor crosses each locus the way genes actually pass down, then names the coat each combination produces. No signup, nothing stored, it all runs in your browser.

01

Set each parent

Tap the genotype you know for the sire and dam. The four common loci show first; five more tuck behind a toggle for when you have a full DNA panel.

02

Watch it recompute

Every tap re-crosses all nine loci instantly. No Predict button: the possible colors, their odds and the registry split update live on the right.

03

Read the flags

Each color is tagged AKC standard or DQ, popular colors are called out, hidden-carrier odds are listed, and a merle × merle pairing raises a health warning.

French Bulldog color guides

Pillar guide · All colorsNew

French Bulldog Colors

The complete genetics guide: the nine coat loci, every standard and in-demand color with its genotype, health, and registry status.

Read the guide~14 min
Guide · Coat lengthNew

Fluffy French Bulldog

The L4 genetics, whether two carriers make one, health, price, and the AKC registration-versus-show status.

Read the guide~4 min

Once you've planned the pairing

You picked the pairing.
Now sell it on the record.

The predictor tells you what's coming. The Breeder Contract Kit covers what to do with a color: deposit agreements that hold buyers to the pairing you planned, a health guarantee that spells out what a DQ color does and doesn't affect, and breeding-rights terms for the ones you keep.

Breeder Contract Kit
9 contracts · $27 · Buy once, own forever
→
Run the COI Calculator
Free tool · check the pairing's inbreeding next
→
Breed Ledger
Store genotypes on every animal, once
→

Other free tools

Tool 01 · GeneticsLive

COI Calculator

Run the coefficient of inbreeding on a pairing across 3 to 6 generations.

Open the tool~5 min
Tool 04 · MarketingLive

Puppy Listing SEO Checker

Paste any litter listing URL. See what Google sees and what to fix.

Open the tool~90 sec

Common questions

Things people ask
about coat color.

No. A disqualification is purely about the AKC French Bulldog show standard and conformation eligibility. Blue, lilac, chocolate and merle are all DQ under AKC, yet the dogs are healthy pets and are accepted by other registries like the UKC and ABKC. The one real health caveat here is double merle (two merle copies), which carries genuine deafness and vision risk, which is why the tool flags it separately.

Every locus starts on its first option, which the tool treats as not carried: homozygous for the common, wild-type allele. So a pairing where you only set merle and dilute is calculated as if both parents are clear on everything else. You never have to fill in all nine loci to get a prediction; set only what you know from a DNA panel or from the parents' visible colors.

Agouti (fawn, sable, tan points) only shows when the K locus allows it. A dog that is solid at K (KB) masks agouti entirely. To see fawn or tan points express, set the K locus / brindle option to "Allows agouti" (ky/ky) on the relevant parent. This mirrors how the genes actually interact, which is why both loci live in the advanced set.

Recessive colors like blue, cocoa, cream, fluffy and pied only appear when a pup inherits two copies. A pup with one copy looks completely standard but can pass the color to its own litters. The hidden-carriers panel shows the odds that a visually normal pup from this pairing silently carries a copy: the gap between what you can see and what a DNA test reveals.

The math is exact Mendelian inheritance per locus, which is how these genes pass down, including the real epistasis where recessive red and the K locus mask other genes. What it can't capture is expression variation, modifier genes, and the handful of colors that involve more than one gene interacting in messy ways. Treat the percentages as statistical odds across many puppies, not a guarantee for any single litter of five.