Ticking, Roaning, and Flecking: How Small Spots and Mottled Patterns Are Inherited

An English Setter covered in small flecks of orange. A German Shorthaired Pointer with a roan coat that looks like pepper sprinkled on white canvas. A Beagle with small ticked spots appearing in its white areas after birth. These patterns look completely different from each other, yet they share a genetic foundation that connects them all.

Ticking and roaning are among the more underappreciated topics in coat color genetics, perhaps because they only express themselves within white areas — and you need to understand the S locus and white marking genetics first to fully appreciate what ticking and roan do. But once you understand them, they add an elegant layer to the color picture.

What Ticking Is

Ticking refers to small, discrete spots of pigment appearing within white areas of a dog's coat. The spots are clearly defined, individual, and randomly distributed. They are not present at birth — ticking in most breeds becomes visible as puppies mature, usually becoming apparent by eight to twelve weeks of age.

The ticking locus (often called T) is dominant. A dog with at least one copy of the ticking allele will show ticking wherever it has white areas created by the S locus. The spots themselves take on the dog's base color — if the dog is black with white, the ticking spots will be black. If it is liver-and-white, the spots will be liver.

Without white areas, ticking has no canvas on which to express. This is why you will not see ticking on a solid-colored dog — there are no white areas for the spots to appear in. Ticking only matters genetically when combined with piebald or other white-producing genes.

What Roaning Is

Roaning produces a more intimate mixing of pigmented and white hairs within the same area. Where ticking produces distinct spots, roan produces a fine, blended mixture that gives the coat a mottled or salt-and-pepper appearance. The boundary between the roan area and the surrounding pigmented areas is often diffuse.

Roan is also believed to be controlled by a dominant allele (or alleles closely linked to the ticking region). Some researchers consider ticking and roan to be different expressions of the same genetic region, varying in how densely the spots are packed. Others maintain they are slightly distinct. The current consensus leans toward a single chromosomal region with multiple alleles or closely linked modifiers producing the range of expressions from light ticking to heavy roan.

The Ticking Allele Behaves Dominantly

Because ticking is dominant, you only need one copy to produce ticked dogs. This has practical implications for breeders who want to produce either ticked or clear-white dogs.

• Two ticked parents can produce clear-white puppies if both parents are heterozygous carriers of the non-ticking allele
• A ticked parent bred to a clear-white parent may or may not produce ticking in offspring, depending on whether the ticked parent is homozygous or heterozygous for the ticking allele
• Two clear-white dogs (both homozygous non-ticking) will never produce ticked puppies

This is exactly the kind of dominant gene analysis that applies across the loci I cover in Color Genetics 101.

Flecking in Australian Shepherds

Australian Shepherds show a pattern often called flecking or marbling in their white areas — distinct from the merle pattern in the rest of their coat. These small pigmented spots in white areas are essentially ticking, following the same dominant inheritance pattern but in a breed context where merle, white markings, and ticking all interact.

In Australian Shepherds, the interaction of the M locus (merle), S locus (white markings), and ticking locus creates some of the most visually complex coat patterns in dogdom. A merle dog with extensive white areas and ticking can show colored flecks of two different shades within the same coat, depending on whether the fleck falls in a merle-diluted area or a normally pigmented area.

Breeds Where These Patterns Are Common

Several sporting and hunting breeds carry the ticking or roan allele as a breed characteristic:

• English Setter — Ticking is characteristic, with heavily ticked dogs called "belton" (orange belton, blue belton, lemon belton)
• German Shorthaired Pointer — Roan is standard; liver roan and black roan are recognized patterns
• German Wirehaired Pointer — Roan patterns similar to GSP
• Brittany Spaniel — Ticking appears in white areas
• Beagle — Ticking can appear in tricolor and bi-color individuals
• Cocker Spaniel — Ticking known in parti-colored individuals; relates to parti-color genetics
• Dalmatian — Though Dalmatian spotting is not the same as standard ticking, it represents the extreme end of the ticking spectrum

The Dalmatian Special Case

Dalmatians deserve a specific mention. Their distinctive spotted pattern is often cited as the extreme end of ticking expression. Rather than small flecks, Dalmatians develop clearly demarcated round spots of black or liver pigment on a white background. The genetics have been attributed to extreme ticking combined with breed-specific modifiers that round and enlarge the spots.

Dalmatians are born white. Their spots appear within the first few weeks of life, just as ticking does in other breeds, reinforcing the connection to the same developmental mechanism: pigment migration into white areas after birth.

Ticking and the Age of Expression

One practical point for breeders: you cannot evaluate ticking in newborns. Puppies that will be ticked are born with clear white areas, and the ticking becomes apparent as they mature. This means selecting against ticking in a litter requires waiting until the ticking has fully expressed — usually by twelve weeks.

This delay in expression can create confusion for new breeders who expect the litter appearance at birth to reflect adult appearance. White areas at birth do not guarantee the adult dog will have clear white — ticking can still appear.

How Ticking Interacts With Other Color Genes

Ticking itself only determines whether small pigmented spots appear in white areas. It does not determine the color of those spots — that is determined by the dog's genotype at the B, D, and E loci. This is an important layering to understand. Ticking adds a pattern modifier on top of an already-established color foundation.

A dog could be black-and-white ticked, liver-and-white ticked, blue-and-white ticked (if also dilute), or yellow-and-white ticked. Each represents the same ticking allele expressing in a different color context. The A, B, C, D, E loci guide covers how to determine that underlying color context.

Selecting For or Against These Patterns

If you breed dogs where ticking or clear white is a breed standard requirement, here is what to know:

• To consistently produce clear white, you need to know the ticking genotype of both parents and aim for homozygous non-ticking pairings
• To consistently produce ticking, at least one parent must carry the ticking allele
• Heavy roan vs. light ticking may be a question of allele combinations or modifier genes that current testing does not fully resolve

DNA testing for ticking is available from several laboratories and can confirm whether a dog carries one or two copies of the ticking allele, helping predict litter outcomes. Compare options in the color testing labs comparison.