The phone call came on a Tuesday afternoon — a breeder I'd worked with for years wanted me to evaluate a litter of Cavalier King Charles Spaniels before they went to their new homes. Learn more about preventive pet care: the here. Eight puppies, all healthy-looking, all wiggly. But I knew that by the time some of those dogs reached age five, at least two or three would likely have mitral valve disease. Not because anyone did something wrong, but because that's what the breed carries.
Every dog breed comes with specific genetic predispositions to certain health conditions. Large breeds face elevated risks for joint disease and bloat, brachycephalic breeds struggle with breathing, and many purebreds carry heightened susceptibility to cancers, heart disease, or eye conditions. Knowing your breed's weak points makes earlier screening and better outcomes possible.
That's what this guide is really about — not scaring anyone away from the breed they love, but giving you the information to be proactive rather than reactive.
Why Breeds Develop Specific Health Problems
Selective breeding works by narrowing genetic diversity. You want a specific coat type, temperament, body shape, or working ability — so you breed dogs that share those traits. The problem is that along with the desired traits, you also concentrate genes for disease.
A gene pool that's narrow enough to consistently produce dogs that look like Golden Retrievers is also narrow enough to carry elevated cancer rates. A body plan compact enough to make a Bulldog look like a Bulldog also creates airways that don't function well. These aren't random coincidences. They're the direct consequence of how breeding works.
I've had owners feel genuinely blindsided by breed-specific health issues. "Nobody told me Bernese Mountain Dogs have such high cancer rates." "I had no idea Dachshunds were this prone to back problems." And honestly, they're right to be frustrated — this information should be part of the conversation before you bring a puppy home, not after the first emergency.
The Major Breed-Size Categories and Their Risks
Giant and Large Breeds
Dogs over 50 pounds — and especially over 90 — face a particular set of challenges. Their joints carry more stress. Their hearts work harder to pump blood through larger bodies. Their bones grow fast during puppyhood, and that rapid growth creates windows of vulnerability.
The big concerns here are orthopedic: hip dysplasia, elbow dysplasia, cruciate ligament tears, and osteochondritis dissecans (OCD). Then there's gastric dilatation-volvulus — bloat — which kills more giant breed dogs than most owners realize. Great Danes, Irish Wolfhounds, and Saint Bernards top that risk list.
Large breeds also have shorter average lifespans. A Great Dane that lives to 10 is beating the odds. That's not something most first-time giant breed owners expect.
Brachycephalic Breeds
Flat-faced dogs — Bulldogs, Pugs, French Bulldogs, Boston Terriers, Shih Tzus — share a condition called brachycephalic obstructive airway syndrome (BOAS). Their skulls have been shortened, but the soft tissue inside hasn't scaled down proportionally. The result is narrowed nostrils, elongated soft palates, and airways that work overtime just to do the basics.
I've had Bulldogs come in for routine checkups sounding like they're breathing through a straw. Some owners think it's normal because "that's just how Bulldogs sound." It's common, yes. Normal? No.
Beyond breathing, brachycephalic breeds face skin fold infections, dental crowding (those teeth have to go somewhere in a compressed jaw), eye problems from shallow sockets, and difficulty regulating body temperature. These dogs overheat fast.
Toy and Small Breeds
Small dogs face their own genetic lottery. Patellar luxation — where the kneecap slips out of place — is the orthopedic issue I see most in Yorkies, Chihuahuas, Pomeranians, and similar breeds. Dental disease runs rampant because tiny jaws crowd teeth together, trapping bacteria. Tracheal collapse is another one, especially in toy breeds middle-aged and older.
Portosystemic liver shunts — where blood bypasses the liver through an abnormal vessel — show up disproportionately in small breeds. Yorkshire Terriers are particularly affected. And hydrocephalus (fluid on the brain) is a concern in some miniature breeds.
The upside: small dogs live longer on average. A healthy Chihuahua reaching 15-17 years isn't unusual.
Medium and Working Breeds
These breeds sometimes get overlooked in the "breed health" conversation because they're not as extreme in conformation. But they carry their own risks. Cocker Spaniels have well-documented ear and eye problems, plus autoimmune conditions. Border Collies carry genes for Collie eye anomaly and epilepsy. Beagles are prone to hypothyroidism and intervertebral disc disease.
Working breeds that were selected for performance rather than appearance sometimes fare better in terms of structural soundness, but they're not immune to genetic disease.
The Cat Side of the Equation
Purebred cats have their own breed-specific risks, and they're often underrecognized because cat breeding is younger and less regulated than dog breeding in many places.
Persian cats face polycystic kidney disease (PKD) at staggering rates — historically around 38% of the breed, though genetic health testing for dogs and cats has helped reduce this. Their flat faces create breathing and eye issues parallel to brachycephalic dogs.
Maine Coons carry elevated rates of hypertrophic cardiomyopathy (HCM), the most common heart disease in cats. Siamese and Oriental breeds are predisposed to certain cancers, respiratory conditions, and a type of liver disease called amyloidosis. Scottish Folds face osteochondrodysplasia — a cartilage and bone disorder directly linked to the gene that causes their folded ears.
Mixed-breed cats aren't immune to genetic disease, but they have broader gene pools and fewer concentrated risks.
Screening and Prevention: What You Can Actually Do
Before You Get the Dog (or Cat)
Research the breed's health profile. Not from fan sites — from veterinary breed health databases and studies. Ask breeders what health testing they've done on the parents. For dogs, the main registries maintain lists of recommended tests per breed: hip and elbow evaluations, cardiac exams, eye certifications, DNA tests for specific mutations.
If a breeder can't tell you the parents' health screening results, that's a red flag.
Once You Have Your Pet
-
Establish a relationship with a vet who knows your breed. I don't mean a breed specialist necessarily, but a vet who understands what to screen for and when. A Cavalier owner and a German Shepherd owner need different monitoring schedules.
-
Don't skip early screening. Hip evaluations at two years (for breeds prone to dysplasia), cardiac evaluations annually for high-risk breeds, eye exams — these catch problems before symptoms appear.
-
Manage weight aggressively. I cannot overstate this. Breed predispositions become clinical problems faster when a dog is carrying extra weight. A Labrador with genetic hip dysplasia that stays lean may never need surgery. The same dog at 15 pounds overweight might be limping by age four.
-
Watch for breed-specific warning signs. A Boxer owner should know what a mast cell tumor looks like. A Golden Retriever owner should be checking for lumps regularly. A Dachshund owner should understand that reluctance to jump isn't just laziness — it could be the first sign of disc disease.
When Breed Information Becomes Overwhelming
I get it. Read enough about your breed's health risks and you'll want to wrap your dog in bubble wrap. A client with a Bernese Mountain Dog once told me she'd stopped reading breed forums because every post was about cancer.
Some perspective: knowing the risks doesn't mean your dog will develop those conditions. A Golden Retriever's lifetime cancer rate is estimated around 60% — which also means 40% of Goldens don't develop cancer. Genetics load the gun, but environment, nutrition, weight management, and preventive care all influence whether it fires.
The point of breed-specific health knowledge isn't worry. It's preparation. The owner who knows Cavaliers are prone to heart disease gets annual cardiac screenings. The owner who doesn't might miss the first murmur until the dog is in heart failure.
And if you're drawn to common health problems across all dogs, the fundamentals — dental care, weight management, parasite prevention, regular vet visits — protect every breed.
The Breeder's Role and the Owner's Responsibility
Good breeders test their breeding dogs and remove affected animals from the gene pool. This is how PKD rates in Persians have dropped. It's how progressive retinal atrophy is becoming less common in some lines. Genetic testing works — when breeders use it.
But breeders can only reduce risk, not eliminate it. The owner's job is to stay informed, screen appropriately, and act early when something looks off.
I've watched breeds change over my career. French Bulldogs have exploded in popularity, and with that popularity came puppy mills cutting every corner on health testing. The breed's health problems have gotten worse, not better, in the last decade. Demand drives supply, and when supply prioritizes volume over health, animals pay the price.
One more thing. Mixed-breed dogs aren't automatically healthy. They have broader genetic diversity, which dilutes some breed-specific risks, but they can still inherit conditions from either parent breed. A Lab-Pit mix can absolutely develop hip dysplasia. A Poodle-anything mix can still carry progressive retinal atrophy.
The difference is that with a purebred, you can predict which conditions to screen for. With a mix, you're sometimes flying blind — unless you do DNA health testing, which has gotten remarkably accessible.
Frequently Asked Questions
Are mixed breeds healthier than purebred dogs?
On average, mixed breeds have slightly lower rates of certain inherited conditions, and one large study found they were less likely to develop 10 of the 24 genetic disorders examined. But "lower risk" isn't "no risk." I've diagnosed hip dysplasia in shelter mutts and cardiac disease in cats of unknown parentage. The individual dog's health depends on far more than pedigree status.
My breed is "supposed to" develop a certain condition. Should I expect it?
Not necessarily — predisposition means increased probability, not certainty. A Dachshund has a roughly 19-24% lifetime risk of intervertebral disc disease, which means the majority of Dachshunds won't develop it. What predisposition should change is your screening behavior, not your anxiety level.
How accurate are DNA health tests for dogs?
For well-studied single-gene mutations — like the MDR1 gene in herding breeds or the SOD1 gene linked to degenerative myelopathy — accuracy is very high using PCR-based technology. For complex conditions influenced by multiple genes plus environment (like hip dysplasia or cancer), DNA tests provide risk scores rather than yes/no answers, and those risk scores are still evolving in accuracy.
Should I avoid getting a purebred dog because of health risks?
That's a personal call. I have purebred dogs myself. What matters is going in with open eyes: research the breed, find a breeder who health-tests, budget for potential veterinary costs, and commit to the screening schedule your vet recommends. Loving a breed means accepting it honestly, health risks included.