Dalmatian nutrition: urate stones, purines and water

Dalmatians handle purines differently from almost every other dog, and that one difference shapes how they should be fed and watched. Most dogs turn uric acid into allantoin, which dissolves easily in urine. Dalmatians excrete uric acid itself, and in some dogs, mostly males, it forms urate stones in the bladder. Plenty of water matters for every Dalmatian. A strict low-purine diet matters most for dogs that have already formed stones, and it needs to be planned with a vet rather than assumed for every dog.

Why Dalmatians make urate stones

Purines are building blocks of DNA found in all animal and plant foods, and the body breaks them down to uric acid. In most dogs the liver then converts uric acid to allantoin. A genetic study found that in Dalmatians uric acid is transported inefficiently in both the liver and the kidney tubules, because of a mutation in the SLC2A9 gene. The trait is recessive, and the authors reported that all Dalmatians they studied were homozygous for it. The same mutation has also been found in some other breeds, including English Bulldogs and Black Russian Terriers.

The result is high levels of uric acid in the blood and urine. Uric acid is far less soluble than allantoin, so when urine is concentrated it can crystallize and grow into stones. These can block the urethra, which is an emergency.

Not every Dalmatian forms stones, and sex makes a large difference. In North American veterinary hospital records, male Dalmatians had about 13 times the odds of forming stones that females had, and the authors concluded that long-term dietary or drug protocols designed for males may not be warranted in females. The AKC's breed health note describes stones as occurring in some males and occasionally in females, and says Dalmatians do not need a special diet for this unless the problem is present.

Matching the diet to the dog

The evidence supports a graded approach rather than one rule for the whole breed.

For a dog that has formed stones, the Merck Veterinary Manual describes feeding a low-purine diet, with or without potassium citrate to make the urine more alkaline, to discourage new stones. Allopurinol can be added to reduce uric acid production, but Merck warns that the low-purine diet then has to be followed strictly, or the dog can form xanthine stones instead. VCA Animal Hospitals describes the diets used as lower in protein and promoting a higher urine pH.

Treats and extras

Organ meats such as liver and kidney are among the richest sources of purines, so liver treats, liver-based pastes and organ-heavy raw diets are poor choices for a male Dalmatian and should be avoided entirely by a dog with a stone history. Eggs and dairy are low in purines and are sometimes used as treats or toppers for these dogs, in small amounts counted against the day's calories. For a dog on a prescription urinary diet, any extra food, including "safe" ones, should be cleared with the vet, because it dilutes the effect of the diet.

Water is the other half

A low-purine diet reduces what goes into the urine. Water decides how concentrated it gets. VCA Animal Hospitals advises that dilute urine, with a specific gravity below 1.020, helps decrease urate stone formation, and that canned foods are preferred for dogs with urate stones because their higher water content produces more dilute urine.

• Water always available: more than one bowl in the house, and water on walks and car trips.
• Wet food or added water: canned food is mostly water, while kibble is mostly dry. Mixing in canned food or soaking kibble raises intake.
• Frequent chances to urinate: the AKC stresses this. Urine held for long hours becomes more concentrated.
• Watch the urine: pale urine is the aim. Consistently dark yellow urine is a reason to raise water intake.

Signs of a urinary problem are straining, passing small amounts often, blood in the urine or licking at the genitals. A male dog that strains and produces little or no urine may have a blocked urethra and needs a vet immediately. VCA notes that urate stones often do not show on ordinary X-rays, so ultrasound or other imaging may be needed to find them, and dogs treated for stones are rechecked regularly for life.

Calories and body condition

The AKC gives the Dalmatian's weight as 45 to 70 pounds (about 20 to 32 kg) and life expectancy as 11 to 13 years, and describes a high-energy dog that needs regular exercise. The Merck Veterinary Manual gives the standard starting point for calories: resting energy requirement (RER) is 70 times body weight in kilograms raised to the power 0.75, multiplied by about 1.8 for an intact adult, 1.6 for a neutered adult and 1.4 for a dog that gains weight easily.

Figures are rounded to the nearest 5 kcal and are starting points. A Dalmatian that runs with its owner most days may need more than the intact column. Prescription urinary diets differ in calorie density from ordinary foods, so weigh the dog every few weeks after any change. The AKC suggests activities such as running alongside a bike, but notes that a puppy's bones and joints are not at mature strength until two years of age and advises caution with strenuous exercise before then.

Other breed conditions that affect feeding

Deafness

Congenital deafness is linked to the breed's white coat pigmentation. In more than 8,900 UK Dalmatian puppies screened by brainstem auditory evoked response (BAER) testing, 17.8% were deaf, 13.4% in one ear and 4.4% in both, and the prevalence declined over the study period. Deafness has nothing to do with diet, but it changes how meals work: a dog deaf in both ears should be approached from the front or woken gently by touch or vibration before a bowl is put down, and taught hand signals for "wait" and "eat".

Itchy skin

When a Dalmatian has chronic itching, repeated ear infections or hot spots, food allergy is one possible cause alongside environmental allergy and parasites. The way to test it is a strict elimination diet chosen with the vet, fed with nothing else for the several weeks the vet advises. For a stone-prone dog, the trial diet also has to suit its urinary needs, which narrows the options and is another reason to plan it with the vet.

Copper-associated hepatitis

Dalmatians are among the breeds predisposed to copper-associated chronic hepatitis, in which copper builds up in the liver and damages it. A 2025 review lists them with Bedlington Terriers, Dobermanns and Labrador Retrievers, and notes that genetic susceptibility combines with environmental factors such as dietary copper intake. Early diagnosis needs a liver biopsy. Loss of appetite, vomiting, weight loss, increased thirst or yellowing of the gums or eyes should be checked promptly. If the disease is confirmed, the vet will prescribe a copper-restricted diet; liver and shellfish are high in copper, and avoiding them fits with a low-purine plan.

Sources

1. Mutations in the SLC2A9 gene cause hyperuricosuria and hyperuricemia in the dog. PLoS Genetics, 2008.
2. Evaluation of the association between sex and risk of forming urate uroliths in Dalmatians. Journal of the American Veterinary Medical Association, 2005.
3. Dalmatian breed information. American Kennel Club.
4. Urolithiasis in Dogs. Merck Veterinary Manual.
5. Urate Bladder Stones in Dogs. VCA Animal Hospitals.
6. Nutritional Requirements of Small Animals. Merck Veterinary Manual.
7. Decline in prevalence of congenital sensorineural deafness in Dalmatian dogs in the United Kingdom. Journal of Veterinary Internal Medicine, 2020.
8. Copper-associated Chronic Hepatitis in Dogs. Veterinary Clinics of North America: Small Animal Practice, 2025.