Certain dog breeds face a significantly higher risk of kidney disease, with some showing elevated kidney markers at nearly twice the rate of the general dog population. A large study of more than 500,000 dogs found that Shetland Sheepdogs, Yorkshire Terriers, and Pomeranians top the list, but the full picture includes both age-related chronic kidney disease and inherited conditions that can strike young dogs.
The 10 Breeds With the Highest Risk
A study published in Veterinary Record analyzed blood samples from hundreds of thousands of dogs and ranked breeds by the percentage showing signs of reduced kidney function in their senior years (over age 10). The top 10, in order:
- Shetland Sheepdog: 18.7% of geriatric dogs showed elevated kidney markers
- Yorkshire Terrier: 17.4%
- Pomeranian: 14.1%
- Shih Tzu: 12.1%
- Miniature Pinscher: 11.4%
- Toy Poodle: 11.0%
- Jack Russell Terrier: 11.0%
- Border Collie: 10.1%
- Chihuahua: 10.1%
- Beagle: 10.0%
Small and toy breeds dominate this list, which makes sense given that they tend to live longer and therefore accumulate more kidney wear over time. But longevity alone doesn’t explain it. These breeds showed statistically higher rates than other small breeds of similar lifespan, pointing to genuine genetic vulnerability.
Boxers are a notable outlier. While most breeds show kidney problems primarily in old age, Boxers had significantly elevated kidney markers across nearly every age group, from puppyhood through age 10. That pattern suggests a breed-specific susceptibility that isn’t simply about aging.
Breeds With Inherited Kidney Conditions
Beyond the age-related chronic kidney disease that affects the breeds above, several breeds carry specific genetic mutations that cause kidney problems earlier in life, sometimes severely.
Bull Terriers
Bull Terriers are prone to hereditary nephritis, a condition equivalent to Alport syndrome in humans. It’s passed down as an autosomal dominant trait, meaning a dog only needs one copy of the defective gene from one parent to be affected. The disease damages the kidney’s filtering structures and causes renal failure at variable ages. Because it’s dominant rather than recessive, it can persist in breeding lines even when breeders are careful, since affected dogs may not show symptoms until after they’ve already been bred.
English Cocker Spaniels and English Springer Spaniels
Both of these spaniel breeds carry mutations in the COL4A4 gene, which provides instructions for building a key structural protein in the kidney’s filters. The mutations create a premature “stop” signal in the gene, so the protein is never completed properly. In English Cocker Spaniels, this condition (called familial nephropathy) has been well-documented, and genetic testing is available to identify carriers before breeding. English Springer Spaniels carry a different mutation in the same gene with similar effects.
Basenjis
Basenjis are uniquely susceptible to Fanconi syndrome, a condition where the kidney’s tubules fail to reabsorb nutrients properly. Instead of recycling glucose back into the bloodstream, the kidneys let it spill into the urine. The hallmark sign is glucose in the urine while blood sugar remains normal or low. This distinction matters because diabetes also causes glucose in urine, but with high blood sugar. If your Basenji’s urine test strips show glucose, a simple blood sugar check can help differentiate the two. Left unmanaged, Fanconi syndrome leads to progressive electrolyte imbalances and kidney damage.
German Shepherds
German Shepherds carry a breed-specific risk for a hereditary kidney cancer syndrome called renal cystadenocarcinoma with nodular dermatofibrosis. It’s caused by a mutation in the BHD gene and produces both kidney tumors and firm skin nodules. The mutation appears to be lethal when a dog inherits two copies, so affected dogs are typically carriers of a single copy. The skin nodules often appear before any signs of kidney trouble, so unexplained firm lumps on a German Shepherd’s skin warrant veterinary attention.
Signs of Kidney Disease at Different Ages
In adult and senior dogs, chronic kidney disease develops gradually. The earliest signs are often subtle: drinking more water than usual, urinating more frequently, and producing paler or more dilute urine. As the disease progresses, you may notice decreased appetite, weight loss, vomiting, bad breath, and lethargy. Because kidneys have significant reserve capacity, dogs typically don’t show outward symptoms until 65% to 75% of kidney function is already lost.
In puppies and young dogs with congenital kidney problems like renal dysplasia, the signs are the same but the timeline is compressed. Excessive thirst and urination usually appear first, followed by the broader signs of kidney failure: poor appetite, vomiting, weight loss, and lethargy. One distinctive clue in very young dogs is stunted growth. If kidney failure sets in during the first few months of life, the puppy may appear noticeably smaller than its littermates. Most dogs with congenital kidney disease are identified between 6 months and 2 years of age.
Screening and Early Detection
Two blood tests form the backbone of kidney screening in dogs. The first measures creatinine, a waste product the kidneys normally filter out. The second measures SDMA (symmetric dimethylarginine), a newer marker that tends to rise earlier in the course of kidney disease. The International Renal Interest Society sets the upper limit of normal SDMA at 14 micrograms per deciliter for dogs. Values of 15 to 17 place a dog in Stage 1 chronic kidney disease, which is the earliest detectable stage.
For breeds on the high-risk list, routine bloodwork that includes both of these markers is the simplest way to catch kidney disease before symptoms appear. Most vets include kidney values in standard wellness panels, but if your dog is a high-risk breed, it’s worth confirming that SDMA is included, since it wasn’t part of standard panels until relatively recently. A urinalysis adds another layer, checking whether the kidneys are concentrating urine properly and whether protein is leaking through.
For breeds with known genetic mutations, like English Cocker Spaniels and Basenjis, DNA tests can identify carriers and affected dogs before any kidney damage has occurred. Basenji owners can also monitor at home using simple urine glucose test strips, checking monthly for the glucose spillage that signals Fanconi syndrome. Finding it early, before electrolyte imbalances set in, makes a meaningful difference in long-term outcomes.
What High-Risk Breed Owners Can Do
Kidney disease in dogs can’t be reversed, but catching it early changes the trajectory dramatically. Dogs diagnosed in the earliest stages and managed with dietary changes (primarily reduced phosphorus and moderate protein restriction) can maintain good quality of life for years. Staying well-hydrated is critical, so access to fresh water at all times matters more for these breeds than most owners realize.
If you own one of the breeds listed above, annual bloodwork starting in middle age (around 5 to 7 years, depending on breed size) gives you the best chance of catching problems early. For breeds with inherited conditions that strike young, like Bull Terriers or English Cocker Spaniels, screening should start much earlier. And if you’re choosing a puppy from a high-risk breed, asking the breeder about genetic testing for known kidney mutations is one of the most practical steps you can take.