Genetic Diversity Percentile: What Your Dog's Score Means
A genetic diversity percentile compares your dog's inbreeding with a panel of other dogs. Here's how to read it, what the raw inbreeding number means, and why it's context rather than a health score.
By PuppyGenes · How we research and write our guides
A genetic diversity percentile tells you how your dog's inbreeding compares with a reference panel of other dogs. In the PuppyGenes report, a dog that's more diverse than about two-thirds of the reference panel has less inbreeding than about two-thirds of the dogs it was compared with. The percentile puts the raw inbreeding number in context. It isn't a health score, a pedigree check or a prediction of lifespan.
The short version
- It's a comparison: your dog's inbreeding estimate set against a panel of reference dogs.
- Higher means more diverse: a higher percentile means less inbreeding than more of the panel.
- The raw number is the inbreeding coefficient, shown next to the panel's median.
- Breeds run high: across 227 breeds, average genotype-based inbreeding was about a quarter.
- It's context, not a verdict on your dog's health, pedigree or lifespan.
What the result is built from
Every dog has two copies of most genes, one from each parent. The inbreeding coefficient estimates how much of the genome carries matching copies because they trace back to shared ancestors. Our guide to COI in dogs explains the idea, and the difference between pedigree and genomic estimates, in detail.
The PuppyGenes genetic diversity section takes a genotype-based inbreeding estimate and compares it with the lab's reference panel of dogs, in plain language. Here's how that looks in our two public example reports:
| Example | Diversity result | Inbreeding coefficient | Panel median |
|---|---|---|---|
| Juno | More diverse than about 66% of the reference panel | 17.0% | 23.8% |
| Marley | More diverse than about 71% of the reference panel | 14.8% | 23.8% |
Both example dogs carry less inbreeding than the panel's middle dog, so both land in the upper part of the comparison.
How to read your dog's percentile
- Read it as a position, not a grade. A percentile of 66 means your dog is more diverse than about two-thirds of the panel, not that it scored 66 out of 100.
- Compare like with like. Many purebred dogs carry substantial inbreeding simply because of how their breed was founded. A 2021 study of 227 breeds found average genotype-based inbreeding of about 25%, with the lowest levels mostly in landrace breeds and breeds with recent crossbreeding.
- Remember what the panel is. The comparison is only as broad as the reference panel, which doesn't represent every dog population.
What the percentile doesn't tell you
- Whether your dog is healthy. Diversity is a reference comparison, not a general health score, and the report does not include genetic disease or health screening.
- How long your dog will live. It isn't a lifespan prediction or guarantee.
- Who your dog's parents were. It doesn't tell you how closely related your dog's parents were, and it isn't a pedigree certificate.
For questions about your dog's health, especially if you're planning to breed, talk to your vet. Our guide to reading a dog DNA report explains every section of the report, and our diversity hub gathers our guides on the topic.
Frequently asked questions
- What does my dog's genetic diversity percentile mean?
- It shows how your dog's inbreeding compares with a reference panel of dogs. "More diverse than about 70% of the reference panel" means your dog carries less inbreeding than about 70% of the dogs it was compared with.
- Is a higher genetic diversity percentile better?
- A higher percentile means more diversity, or less inbreeding, than more of the reference dogs. It's useful context about your dog's genetic background, but it isn't a health score, and it doesn't predict how healthy your dog is or how long it will live.
- What is a normal inbreeding level for dogs?
- It varies a lot by background. A 2021 study of 227 breeds found average genotype-based inbreeding of about 25%, with landrace breeds and breeds with recent crossbreeding at the low end. That's why a percentile against a reference panel is easier to read than a raw number.
- Why is my purebred dog's diversity percentile low?
- Many breeds were founded from a small number of dogs and kept within a closed stud book, so purebred dogs often carry more inbreeding than dogs from mixed backgrounds. A lower percentile describes that breed history; it isn't a diagnosis of anything about your dog.
- Does a low diversity percentile mean my dog will be unhealthy?
- Not on its own. The percentile is a comparison with other dogs, not a health result, and the PuppyGenes report doesn't include genetic disease or health screening. If you have questions about your dog's health, talk to your vet.
From general to personal
See how this applies to your dog specifically.
Our at-home Complete Dog DNA Test adds your dog's own results to these tips across six report sections: breed ancestry, coat colour, physical appearance, temperament and size predictions, genetic diversity and oral microbiome. The report does not include genetic disease or health screening.