D-Locus + Co-Locus
Lilac French Bulldog Genetics
The complete guide to the d/d + co/co combination. How dilute and cocoa genes create the stunning lilac shade, with breeding charts and pricing.
Predict Lilac OutcomesWhat Makes a Frenchie Lilac?
Lilac is a combination color produced by stacking two recessive genes. Understanding how D-locus and Co-locus interact is key to breeding for this rare phenotype.
D-Locus (d/d) — Dilute
The dilute gene lightens all pigment. On its own, d/d produces a blue-gray coat. When combined with cocoa, it lightens brown pigment to create the silvery-lilac shade.
Co-Locus (co/co) — Cocoa
The cocoa gene further lightens brown pigment. On its own, co/co produces a cocoa-toned coat. When combined with dilute, it creates the silvery-lilac shade that defines the lilac phenotype.
Lilac Breeding Combinations
These are the most common D-locus and Co-locus pairings breeders use to produce lilac Frenchies.
Lilac vs. Blue vs. Isabella
These three rare colors are closely related but genetically distinct. Here's how they differ at the DNA level.
Blue
d/d
Dilute only. Black pigment lightened to blue-gray. The simplest dilute phenotype.
$4,000 – $8,000
Lilac
d/d + co/co
Dilute + cocoa. Brown pigment lightened to silvery-lilac. Two-locus combination.
$7,000 – $15,000
Isabella
d/d + b/b + co/co
Dilute + chocolate + cocoa. Even lighter champagne-brown. Three-locus ultra-rare combo.
$10,000 – $20,000
Plan Your Lilac Litter
Our DNA Calculator predicts lilac outcomes across both D-locus and Co-locus simultaneously. See exact probabilities for blue, cocoa, lilac, and black puppies before you breed.
Open the DNA CalculatorFrequently Asked Questions
What makes a French Bulldog lilac?
A lilac French Bulldog is produced by combining two recessive genes: the dilute gene (d/d at the D-locus) and the cocoa gene (co/co at the co-locus). The dilute gene lightens all pigment, and the cocoa gene produces a lighter brown base. When both act together, the result is a silvery-lilac or taupe-colored coat — one of the most visually striking and sought-after Frenchie colors.
How is lilac different from blue?
Blue Frenchies have only the dilute gene (d/d) — their coat is a blue-gray shade derived from diluted black pigment. Lilac Frenchies have both dilute AND cocoa (d/d + co/co). The cocoa gene creates a lighter brown base, and then the dilute gene lightens that brown to a silvery-lilac shade. Blue is gray; lilac is a warm silvery-brownish-gray.
How much does a lilac French Bulldog cost?
Lilac French Bulldogs typically cost between $7,000 and $15,000. The price depends on DNA verification, pedigree, structure, health clearances, and whether the dog carries additional rare traits like fluffy (L-locus) or merle (M-locus). Lilac is rare because producing d/d + co/co requires both parents to contribute recessive alleles at two separate loci.
Can two lilac Frenchies produce non-lilac puppies?
If both parents are lilac (d/d, co/co) and homozygous at both loci, 100% of puppies will be lilac. However, if either parent carries a dominant allele at either locus (e.g., D/d or Co/co), the litter will include some non-lilac puppies. Use the DNA Calculator to model your specific pairings and see exact probabilities for every outcome.
What is the difference between lilac and Isabella?
Lilac is produced by d/d + co/co (dilute + cocoa). Isabella adds a third gene: the B-locus chocolate allele (b/b). So Isabella is d/d + b/b + co/co — dilute + chocolate + cocoa. The chocolate gene further modifies the brown pigment pathway, creating an even paler champagne or taupe shade. Isabella is rarer and typically more expensive than lilac.
Do lilac Frenchies have health problems?
The lilac color genes (Co-locus and D-locus) do not cause health problems. However, unethical breeders may skip health testing to focus on color production. Always verify DM, HUU, JHC, and CMR1 clearances regardless of coat color. Health depends on breeder ethics and DNA health screening — not the color itself.