Coat color calculator and visualizer

Creatures has two coat color tools, and the single most useful thing to know up front is that they are different tools with different jobs:

• The Coat Color Calculator answers "what colors could their babies be?" You describe the two parents and it predicts the offspring coat colors. It is the planning tool for a pairing. Its hub is /tools/coat-color-calculators and each one lives at /{species}-coat-color-calculator.
• The Coat Color Visualizer answers "what does THIS animal look like, and why?" You toggle one animal's genes and watch its coat picture change. No parents are involved; it is a learning and reference tool. Its hub is /tools/coat-color-visualizers and each one lives at /{species}-coat-color-visualizer.

The calculator covers three species: Highland cattle, miniature donkeys, and Nigerian Dwarf goats. The visualizer covers two: Highland cattle and miniature donkeys. This guide covers all of them.

A plain-language genetics primer

You do not need to be a geneticist to use either tool. Here are the terms they use, in everyday language:

• Sire and dam mean father and mother.
• A gene (or locus) is a specific spot in the DNA that controls one trait. For example, the Extension gene controls whether the base color is black-family or red-family.
• An allele is one version of a gene. Every animal carries two alleles per gene, one inherited from each parent.
• Homozygous means the two alleles match (for example e/e). Heterozygous means they differ (for example E/e). The calculator's Genetics picker labels options this way.
• Dilution is a gene that lightens the base color. In Highland cattle, for instance, the PMEL dilution turns black toward dun and then silver as you add copies.
• Phenotype is what you see (the color name). Genotype is the underlying allele combination (for example ED/e). The results show both.

The Coat Color Calculator

The calculator covers three species, in two different input styles. Highland cattle and miniature donkeys use the two-parent-color model described in this section: you pick each parent's color and it returns the odds of each offspring color. Nigerian Dwarf goats use a different, observation-based model, because goat color genetics do not support the same clean odds; that tool has its own section further down. The coat color calculators hub lists all three.

The inputs

• Sire color and Dam color. Two dropdowns, one per parent, where you pick that parent's coat color from the species' recognized colors. These are the minimum required inputs; leave one blank and the tool asks you to select the sire or dam coat color. The recognized colors are:
• • Highland: Red, Yellow, White, Black, Dun, Silver.
  • Donkey: Red, Black, Gray, Brown, Ivory.
• Genetics (optional). Below each parent is an optional Genetics panel where you can set that parent's exact alleles per gene, for a finer prediction than color alone. Each gene is shown as homozygous or heterozygous radio options, and the default is Unknown, which means "I do not know, so use this color's typical genetics." Unknown is completely fine.
• • Highland genes: Base / MC1R (Extension), which sets black-family versus red-family pigment, and Dilution / PMEL, which sets how much the color is lightened (none, then dun, then silver).
  • Donkey genes: up to six. Extension (black versus red), Dun (a dilution that also brings the dorsal stripe, shoulder cross, and leg barring), Brown, Light Points / Pangare (a pale muzzle, eye rings, belly, and inner legs), Dominant White / white pattern, and Roan (white hairs mixed through the coat).
  • The implication: leaving Genetics on Unknown predicts from the color alone; specifying alleles narrows the odds. As you choose, the page even auto-selects the matching color and hides combinations that are impossible for it, so the picker keeps you consistent.
• Calculate. The result loads in place, so your scroll position and any open Genetics panels are preserved.

The output: Offspring Probabilities

The result is a grid of outcome cards, one per possible offspring color. Each card shows the color name, the percentage chance of it (for example 25%), an illustrative image of that color, and, when you supplied genetics, the possible genotypes behind that color as small chips with their own sub-percentages (a "Show more" control expands the rest). For donkeys, an outcome card can include an image carousel of the visual variants, such as the spotted, roan, or light-points version of a color.

Two things to trust and one to remember:

• The math is real. The percentages come from proper Mendelian inheritance (Punnett-square allele segregation), not a guess, so they reflect genuine genetics.
• They are still probabilities, not promises. A pairing that has a 25% chance of a color can still produce any of its possible colors. The tool says to monitor development and confirm the final coat color after the first shed, because a calf's or foal's color can change as it matures. For an unusual pairing the tool may fall back to a general "expect a blend of both parents" note.

The Genetics Guide

At the bottom of the Highland and donkey calculators is a Genetics Guide: a reference for what each gene and allele does, credited to the UC Davis Veterinary Genetics Laboratory. It also surfaces responsible-breeding facts, including that some donkey white-pattern combinations are non-viable (for example homozygous dominant white). A good breeding tool flags exactly these, so you can plan a pairing that avoids them.

The Nigerian Dwarf goat calculator

Nigerian Dwarf goats get their own calculator at /nigerian-dwarf-goat-coat-color-calculator, and it works differently from the Highland and donkey tools on purpose. Goat color genetics are not settled the way cattle and donkey color are: no study has mapped the familiar breeder pattern names onto confirmed goat alleles in Nigerian Dwarf specifically. So instead of asking you to pick a color and handing back tidy odds, this calculator asks you to record the traits you can actually see on each parent, and it answers only for the part of goat color that published research supports: the Agouti pattern series. Everything else is kept visible as separate, clearly labeled evidence rather than folded into a number.

The page calls this observed-phenotype mode, and its opening note sets the honest expectation: a complete inventory of goat traits does not mean a percentage for everything, and recording a trait here does not imply that a commercial Nigerian Dwarf coat-color DNA test exists (there is not one).

What the Agouti pattern series means

One term unlocks the whole tool. Agouti is the gene that decides which regions of a goat turn tan and which stay dark. Each Agouti allele switches a specific set of body regions to tan, a goat carries two alleles, and a kid shows the tan regions of both. The catch, and the reason you get a range instead of a single number, is that a coat cannot reveal a parent's hidden second allele: two goats that look identical can carry different second alleles and produce different kids. The calculator handles this honestly by working out every genotype consistent with the coats you described and reporting the full span of outcomes across them, without assigning any one of them a likelihood. It predicts the pattern only, not whether the tan comes out gold, cream, or red. And because the pattern-name-to-allele mapping is inferred from goats in other breeds, every result is educational rather than a lab result. The model draws on the published goat-color literature (Sponenberg's goat color genetics and the Agouti-series work of Adalsteinsson in 1994 and Henkel in 2019), not on UC Davis VGL, which sells no goat color test.

The inputs: describe each parent

You fill in a Sire and a Dam block, each identical. Only the first field is required; every other section can stay collapsed.

• Base coat pattern (required). This is the one input that drives the calculation. You pick the closest visible pattern from a menu, and the small print says it plainly: pattern names are observation adapters, not proof of a genotype. The options are:
• • Gold, red, or cream, Chamoisee (the pattern the Oberhasli breed is built on), Cou blanc or cou clair, Swiss markings (the Toggenburg pattern), and Solid black. These five map to a reviewed Agouti allele, so they feed the numerical range.
  • Buckskin, Cou noir, and Sundgau are each labeled "observation only; no numerical prediction," because the visible pattern does not pin down a single reviewed allele.
  • Other pattern, Unknown, and Cannot score from what I can see record an honest non-answer. Choosing an observation-only or non-answer option for either parent means the base panel returns a descriptive result instead of a range.
• Additional coat traits (optional). A collapsed section for everything that is not the base pattern. Most of these use the same vocabulary: Observed present, Not observed, Unknown, Cannot score, or left as Not recorded. Each is recorded, never multiplied into the base pattern:
• • Frosted Points, Roan, Belt, and Moonspots, each recorded on its own so it stays separate from the others and from white spotting.
  • Dark-pigment tone: Black, Brown or chocolate, Not visible, or Other. It is an observation only, because the coat does not identify the underlying pigment gene.
  • Tan or red pigment depth: Cream, Gold, Red, Near white, or Not visible. This is the shade of the tan, kept separate from the Agouti pattern the calculator predicts.
  • White markings: a state (Observed present, Not observed, Unknown, Cannot score) and, when present, one or more families: general white spotting, pinto or broken, mostly or all white, Nigerian pattern, Schwartzal, white poll/cap/blaze, ticking, calico, or other.
  • Other or unsure: a free-text box (up to 240 characters) for wording the menus do not cover. It never selects a calculation model.
• Eyes and observation limits (optional). A second collapsed section for context that can change how a coat reads without changing its genetics:
• • Eye phenotype: Brown, Yellow or amber, Blue, Marbled or partially blue, Uncertain, or Other.
  • Age stage (Kid or Adult) and Sex context (Doe, Buck, or Wether), because both can shift how a color presents.
  • Observation confidence: a clear direct look, a photo only, or partly obscured, so the tool knows how sure you are.
• Calculate offspring ranges. The submit button; results appear below the form. A "Back to Coat Color Calculators" link returns you to the hub.

The results: one panel per kind of evidence

The results are deliberately layered so that percentages from different traits are never multiplied into a made-up combined color chance. Each panel stands alone:

• The base-pattern panel. When both parents' base patterns map to alleles, the heading reads "Calculated base-pattern range" and you get a grid of outcome cards. Each card names a pattern and carries a range, not a single odds figure: a plain percentage when every scenario agrees, "up to 25%" when the floor is zero, or "50% to 100%" when the scenarios spread. A card can also read "Not predictable" when the pairing has no honest prediction. A short "Agouti mapping scope" note repeats that these ranges span every compatible parent genotype without ranking them, and that the pattern names are inferred adapters, not breed genotype tests. If either parent used an observation-only or non-answer base pattern, the panel instead shows a descriptive result and the observation state rather than a range.
• Why this is a range. An expandable panel breaks the range into its presentation scenario groups: each group lists the pattern odds it would produce and, one level deeper, every compatible sire-by-dam genotype assignment behind it. This is where you can see exactly why the calculator refuses to collapse the answer into one number.
• Representative paintings. Where a reviewed illustration exists, cards show one, tagged "Reviewed result example" or "Representative appearance." A separate expandable gallery shows paintings that match only the parent base colors you selected. Both are labeled as visual examples of how appearance can vary, not extra predictions.
• Frosted Points. If you recorded it, it gets its own panel marked "Gated pending full-text review": the calculator shows the readable evidence counts it has but deliberately gives no percentage and no image, because that trait's evidence is not settled.
• Other observed trait evidence and alternative mechanisms. Two more expandable panels collect the remaining traits (each marked "conditional evidence" or "not currently predictable") and known confounds, such as the fact that a solid-black goat can carry either of two genotypes that look identical. Nothing here is turned into a headline probability.

Below everything, a scientific scope summary restates the boundary: the numbers cover the reviewed Agouti model, and tone, shade, eyes, white-marking families, roan, belt, moonspots, Frosted Points, age, and observation limits stay visible as separate, nonnumeric evidence.

Keeping a goat plan (the signup handoff)

If you are signed out, the result ends with a "Keep this breeding plan with your goats" block: a short form (first name, last name, email) that creates a free Creatures account and carries this exact observed-phenotype cross forward. Once your account is ready you land straight in the add-animal flow, with the species already set to goat and the cross carried along, so the plan is kept with the goat you add. The full add-animal flow is covered in Adding an animal to Creatures. Signed in, this block does not appear: the calculator is a run-anytime page rather than something saved to a profile, so rerun it whenever you are planning a pairing.

The Coat Color Visualizer

The live visualizers are Highland cattle and miniature donkeys, the two cards the visualizer hub lists. The visualizer is the learning tool: instead of two parents, you take one animal and explore how its genes shape its coat. Not every calculator has a matching visualizer, so the visualizer hub can list fewer species than the calculator hub.

How it works

• You see a row of gene groups. Each gene has two allele buttons, one per copy the animal carries. Click a button to cycle that copy through the gene's allele options.
• As you toggle, the result updates instantly in your browser, with no reload and no server call: a color name (for example "Light Red") and a picture of the coat chosen for that exact genotype both change live. A Download button saves the result image.
• Highland genes: Base (MC1R / Extension), Dilution (PMEL), and Agouti (ASIP, which produces brindle). The Highland page also shows a "Seven Recognized Colors" gallery: Black, Dun, Red, Yellow, White, Brindle, and Silver.
• Donkey genes: Extension, Dun, Dominant White, Brown, Light Points, and Roan. Each gene is explained in the page's own Genetics Guide, with the same UC Davis sourcing.

Which tool, when

One sentence to keep them straight: the visualizer is for learning ("see how each gene changes the coat" on a single animal), and the calculator is for planning ("see what a pairing could produce" from two parents). Many breeders use the visualizer to understand a gene, then the calculator to plan the cross.

Where to go next

These tools are the front end to the real breeding and genetics features on Creatures:

• For a grounding in genetics on Creatures: Genetics overview.
• To record the cross you planned: Recording a breeding and The breeding dashboard.
• To capture lineage: Care, growth, and identity records.
• For pregnancy due dates: Using the gestation calculator.
• For the full set of tools: The Creatures Tools page.

Related information

• The Creatures Tools page: calculators, visualizers, and generators
• Animal and organization name generators
• Estimating animal weight with the weight calculator

Updated on: 22/07/2026