04/30/2026
There’s a long-standing belief that mixed breed dogs are healthier than purebred dogs. It’s a common claim—but in practice, it’s not that simple.
With purebred dogs, you do get consistency. Predictable traits, structure, temperament—but that also means you can see patterns in genetic strengths and weaknesses. Certain conditions can show up more frequently within a breed.
The difference is that responsible breeders are actively working to understand and reduce those risks. Genetic health testing is widely available, and good breeders use breed-specific panels along with evaluations like hips, elbows, shoulders, and eyes to make informed breeding decisions.
Is that a guarantee of a perfectly healthy dog? No.
It’s information—not a promise.
Ethical breeders won’t pair two carriers or knowingly breed affected dogs, but there are still things we can’t predict or fully test for. In Border Collie, for example, epilepsy and deafness are two conditions that can still appear despite careful planning, research, and selection. These issues are actively being studied, and many breeders participate in ongoing research to better understand them.
With mixed breeds, you often see more genetic variation (heterozygosity). That can reduce the likelihood of some conditions expressing—but it doesn’t eliminate them. Recessive traits can still surface, and in many cases, it’s a bit like rolling the dice. You may not know what’s there until it shows up.
One key difference is traceability.
With pedigreed dogs, there are records. People put their names behind their breeding programs, and there’s often ongoing communication between breeders and owners. Health and temperament trends are more likely to be tracked and shared. There’s also awareness of specific genetic concerns—like the MDR1 gene mutation, which affects sensitivity to medications such as ivermectin. That’s especially important for working dogs in environments like farms.
In contrast, with many mixed breeds, that line of communication often doesn’t exist. Owners may not be connected to littermates or breeders, and rescues don’t always have access to full background information. That can make patterns harder to identify—not necessarily less common.
The reality is, I’ve seen both purebred and mixed breed dogs struggle with the same health issues.
These problems don’t automatically disappear just because a dog is mixed.
A lot of the “mixed breeds are healthier” narrative comes from limited data, less traceability, and the challenges that come with smaller or closed gene pools in some breeds. But no dog—purebred or mixed—is guaranteed to be free of health concerns.
At the end of the day, it’s not about one being better than the other.
There is value in well-bred purebreds, purpose-bred mixes, and mixed breed dogs.
Instead of arguing over which is superior, we’d do far better focusing on what actually improves dogs’ lives: responsible breeding, informed ownership, open communication, and continued research.
That’s how we move forward.
That’s how we create healthier dogs—together.
Belles and Whistles Border Collies
