What Does Clear, Carrier, and At Risk Mean in Dog Genetics
These three terms appear on every genetic health report — and understanding them is essential for making responsible breeding decisions.
The Three Statuses Explained
Clear
A Clear dog has zero copies of the genetic variant being tested.
- Does not carry the gene
- Cannot pass the gene to offspring
- Safe to breed to any dog, including carriers, without risk of producing affected puppies
A Clear result does not mean the dog is free of all health issues — only that it does not carry this specific variant.
Carrier
A Carrier dog has one copy of the variant.
- Does not show symptoms (for most recessive conditions)
- Appears completely healthy
- Can pass the gene to approximately 50% of offspring
- Can produce "At Risk" puppies if bred to another carrier
This is why carrier status matters so much — carriers look normal, which is exactly what makes them easy to unknowingly spread through a breeding program.
At Risk
An At Risk dog has two copies of the variant.
- May show symptoms of the associated condition
- Will pass one copy to every single offspring (making all puppies at least carriers)
- Should only be bred to a Clear dog, and only after careful consideration
How These Statuses Interact in Breeding
| Pairing | Possible Offspring |
|---|---|
| Clear × Clear | 100% Clear |
| Clear × Carrier | 50% Clear, 50% Carrier |
| Carrier × Carrier | 25% Clear, 50% Carrier, 25% At Risk |
| Clear × At Risk | 50% Clear, 50% Carrier |
| Carrier × At Risk | 25% Carrier, 50% At Risk |
| At Risk × At Risk | 100% At Risk |
The most important rule: never pair two dogs that are both Carriers for the same condition. Every litter would carry a 25% chance of producing an At Risk puppy.
Common Conditions Where This Matters
| Breed Group | Condition to Watch |
|---|---|
| Poodles / Doodles | PRA (Progressive Retinal Atrophy), DM, vWD |
| French Bulldogs | CMR1 (Canine Multifocal Retinopathy) |
| Collies / Aussies | MDR1/ABCB1 drug sensitivity |
| Labradors | EIC (Exercise Induced Collapse), CNM |
| Golden Retrievers | PRA1, PRA2, ichthyosis |
Practical Breeding Strategy
- Test both dogs — you cannot manage what you do not know
- Check for overlap — if both dogs carry the same variant, reconsider the pairing
- Prioritize high-risk conditions first — not all carriers need to be avoided; severity matters
- Inform buyers — if you produce any carriers in your litter, disclose this to puppy buyers
A Note on Dominant Conditions
For dominant conditions (where one copy is enough to cause problems), the rules change:
- Even carriers may show symptoms
- Clear × Affected pairings produce 50% affected offspring
- These conditions require stricter management
Merle is a good example — a single copy creates the merle coat and is generally healthy, but two copies (double merle) causes significant health issues.
The Bottom Line
Clear, Carrier, and At Risk are not value judgments — they are information. A carrier dog can be an excellent breeding animal when paired thoughtfully with a clear partner. The goal is not to eliminate carriers from your program overnight, but to make informed decisions that reduce the incidence of At Risk puppies over time.