Canine Kidney Stones
"Canine kidney stones are not common in dogs. Symptoms are focused around the length and frequency of urination. Treatment options include surgery to remove stones, dietary change and nutritional supplements."
When stones form in the kidneys, they often block the openings to the ureters. This causes a condition called hydronephrosis, in which the kidney becomes swollen with pressure from backed up urine. It can cause serious kidney damage and can be life-threatening if not treated in a timely manner.
There are risk factors for older castrated dogs, obese dogs and small breeds, particularly the Miniature Schnauzer.
Canine Kidney Stones SymptomsSymptoms of dog kidney stones include frequent urination, often in small amounts, and often in unusual places. Your housebroken pet may begin peeing in the house. Symptoms include dribbling urine, straining to urinate, and blood in the urine. Other symptoms include weakness, depression, loss of appetite, vomiting, and abdominal pain. In severe cases, your dog may not be able to urinate at all.
If your dog has kidney stones symptoms, he needs to see a vet. Kidney stones are a serious medical condition that requires prompt medical treatment.
Canine Kidney Stones DiagnosisIf kidney stones are suspected, your vet will take x-rays. The stones will usually show up white on the x-ray. Some kinds of stones don't show up on x-rays and can only be seen by ultrasound. Your vet will look for stones elsewhere in the urinary tract as well.
Your vet will also test your dog's urine to see if he has a bladder infection. Bladder infections are very common in pets with kidney stones.
Canine Kidney Stones TreatmentDog kidney stones must usually be removed surgically. In some cases, the kidney has been damaged to the point that it must be removed. Your dog can live with just one functioning kidney if this is the case.
Special diets can also be used to prevent and treat kidney stones. The S/D diet produced by Hills can actually cause stones to dissolve. Purina also makes a special diet for dogs with kidney stones. These diets work because they contain lower than usual amounts of protein, magnesium, and phosphorus, which are things that contribute to the formation of kidney stones.
Recent studies recommend a canned diet because it has higher moisture content. If your dog will not eat canned food, consider, adding water to dry food to moisten it the best that you can. Your veterinarian may retest your dog's urine after dietary change to recheck the sediment in the urine. If your dog will not tolerate a dietary change, then other approaches might be tried to increase the intake of water.
Dietary supplements may also help avoid kidney stones. Magnesium , citrates and phosphates are believed to inhibit stone formation. A moderate to slightly increased protein content may also be beneficial in the prevention urolithiasis .
Foster, Race DVM and Smith, Marty DVM
Holt, P. E.
Canine and Feline Calcium Oxalate Urolithiasis in Dogs and Cats
University of California, Davis
School of Veterinary Medicine