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set in stone: petplan pet insurance on bladder stones in dogs and cats

  • Dr. Kim
  • Posted by Dr. Kim Smyth on
    Staff Veterinarian and Pet Health Writer of Petplan

Some problems affecting our best friends sound like lessons out of a medical text book, but bladder stones are just what they seem – stones found in the bladder. Despite their straightforward name, these stones are undesirable because they can cause quite a bit of irritation in the bladder, and occasionally they can find their way out of the bladder to the urethra, where they cause life-threatening obstructions.


Bladder stones form in the bladder when conditions are favorable. Sometimes there are hereditary reasons (just like in humans), and sometimes chronic infections or metabolic diseases are to blame. According to the Winn Feline Foundation, up to 13% of cats with lower urinary tract disease today have uroliths (bladder stones).


There are several different types of bladder stones, but let’s focus on the four most common:


Calcium Oxalate 
These are the stones that seem to have a hereditary component. We find them in middle aged to older pets, and there are certain dog breeds that are more prone, such as the Miniature Schnauzer, Lhasa Apso, Yorkshire Terrier and the Bichon Frise. 


Infection-induced Struvite stones
As their name implies, these stones are most often caused by bladder infections. Some kinds of bacteria that cause bladder infections produce urease, which alters the pH of the urine, making it favorable for the formation of struvite stones. Struvite stones associated with infection are most common in dogs, and will cause recurrent urinary tract infections.


Sterile Struvite stones 
These are more common in young cats. Thankfully, veterinarians are seeing less and less of these stones as food formulations change to try to prevent them.


Urate stones 
Urate stones are caused by an increased excretion of urates in the urine. Dalmatians and Bulldogs are affected by urate stones more frequently than other breeds. In addition, liver disease (such as liver shunts or cirrhosis) can cause urate stones.


Bladder stones may be suspected if your pet has chronic urinary tract infections, bloody urine, or discomfort during urination. Male cats are especially prone to urethral blockage from stones due to their narrow urethras. Blockage of the urethra (the passage way for urine out of the body) is life-threatening in any animal.


Your veterinarian can find most stones on an X-ray, but this will not determine what kind of stones are present. A urinalysis can give some clues, as the urine pH will be different with different stones. The only way to be 100% sure about the type of bladder stone your pet has is to remove them surgically. In fact, in the case of urate and calcium oxalate stones, this is the only way to get rid of them.

Struvite stones can often be dissolved by placing your pet on a special diet, but if the stones are posing a threat it’s best that they are removed surgically as well. Because surgery is often necessary in cases of bladder stones, having Petplan pet insurance, which can cover hereditary or chronic conditions such as bladder stones, can help with the costs of care.

Struvite stones can be prevented by controlling urinary tract infections and by feeding a diet that creates a more acidic urine. Unfortunately, there is no good way to control calcium oxalate stones. Special diets are available that may allow the stones to form more slowly, but they will still form over time. In the case of urate stones, the underlying cause should be addressed to help prevent stone reformation.


If chronic urinary tract infections are plaguing your pets, your veterinarian’s office is just a stone’s throw away!

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Posted by TCR
on October 08 2011 10:30

Timely blog--I just came from getting the news my female dog has bladder stones and she's having surgery on Oct 12, 2011. I'm worried but not as worried as when the vet told me, before the x-ray, that the ultrasound showed something wrong and it could be stones or a tumor. Right now I'm hoping all goes well and my dog is relieved of her difficult urinating and blood in urine. I'm glad I did not let my Petplan insurance lag in these tough economic times. And, as savvy as I consider myself, I never heard of bladder stones in dogs nor did I encounter it mentioned when I researched online.

Posted by David Mead
on October 06 2011 10:07

My cat of ten years started straining to urinate and then would bleed on the carpet with no urine present. The vet found many stones in her bladder and surgery was performed. She is fine now but the cost was close to $1,000. The next week I purchased Petplan insurance in case of another occurance.

Posted by Becky Moore
on October 05 2011 10:54

I see that Bichon Frise are prone to the Calcium Oxalate type stones. Are other breeds in the Bichon Frise family (Maltese) hereditarily prone to these as well?

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