Bladder Stones in Dogs: Diet, Symptoms & Foods to Avoid
Bladder stones in dogs are not all the same. This guide looks at the main types of urinary stones, symptoms, breeds that may be more susceptible, how diet can help and why simply switching to fresh food isn't necessarily the answer
If your dog has been diagnosed with bladder stones, one of the first things you may find yourself Googling is:
“What should I feed a dog with bladder stones?”
Unfortunately, there isn't one universal bladder-stone diet out there for dogs
In fact, this is one of those conditions where changing your dog's food without knowing exactly what type of stone you're dealing with could take you in completely the wrong direction. Owners come to me all the time with “my dog has bladder stones” and every time I need to send them away to clarify what type.
Struvite stones, calcium oxalate stones, urate stones and cystine stones form for different reasons and require different approaches to treatment, prevention and diet.
And while social media may tell you that switching from kibble to a fresh or raw diet is the answer, urinary disease is actually a very good example of why the nutritional composition of a food matters far more than how fresh it is.
So, let's look at what bladder stones are, why dogs develop them and where nutrition actually fits in.
What are bladder stones in dogs?
Bladder stones – also known as uroliths or urinary calculi – are solid collections of mineral material that form within the urinary tract.
Crystals can develop when substances naturally present within urine become sufficiently concentrated and the urinary environment allows them to precipitate. These crystals can then aggregate and form stones.
Although we commonly call them bladder stones, uroliths can occur in different parts of the urinary tract, including the bladder, kidneys, ureters and urethra.
The most common types of urinary stones seen in dogs include:
Struvite
Calcium oxalate
Urate
Cystine
Less common stones include silica, calcium phosphate and xanthine.
The type of stone matters because the diet appropriate for one type isn't necessarily appropriate for another.
What are the symptoms of bladder stones in dogs?
Bladder stones can cause symptoms that look very similar to a urinary tract infection.
You might notice:
Blood in the urine
Straining to urinate
Urinating very small amounts frequently
Asking to go outside more often
Accidents indoors
Licking around the urinary opening
Discomfort when urinating
Restlessness
Recurrent urinary tract infections
Some dogs can have bladder stones without showing particularly obvious symptoms, especially when stones are first developing.
When bladder stones become an emergency
If your dog is repeatedly trying to urinate but little or no urine is coming out, this requires urgent veterinary attention.
A stone can move into the urethra and prevent urine from leaving the bladder. A complete urinary obstruction is a veterinary emergency.
This is particularly concerning in male dogs because of the anatomy of the male urethra.
What are the different types of bladder stones in dogs?
This is where things become particularly important from a nutritional perspective.
1. Struvite stones in dogs
Struvite stones are largely composed of magnesium, ammonium and phosphate.
But here's the bit that's often missed when owners are given generic dietary advice:
In dogs, struvite stones are commonly associated with urinary tract infections.
Certain bacteria produce an enzyme called urease. This changes the urinary environment and promotes the formation of struvite crystals and stones.
So simply changing food isn't necessarily going to solve the problem.
The infection itself also needs to be diagnosed and treated appropriately.
One advantage of struvite stones is that, in suitable cases, they can often be medically dissolved rather than surgically removed.
Veterinary dissolution diets are specifically formulated to manipulate urine composition and reduce the availability of components needed for struvite formation.
During dissolution, following the prescribed diet properly is really important.
Adding large quantities of:
Meat
Treats
Toppers
Supplements
Homemade food
Other commercial foods
can change the overall nutrient profile you're deliberately trying to create.
Does a dog with struvite stones need a urinary diet forever?
Not necessarily.
When struvite stones are caused by infection, recurrence is commonly related to incomplete stone removal/dissolution or another urinary infection. Once infection-induced stones have resolved, long-term dietary management may not always be needed.
That's very different from simply being told:
“Your dog has bladder stones, so they need urinary food for life.”
It depends on the stone.
Which dogs are more prone to struvite stones?
Struvite stones occur more commonly in female dogs, largely because females are more prone to the urinary infections associated with infection-induced struvite stones.
Several smaller breeds are commonly represented in clinical populations, but breed alone cannot tell us which stone a dog has.
2. Calcium oxalate stones in dogs
Calcium oxalate stones are another common urinary stone seen in dogs.
Unlike struvite stones, calcium oxalate stones cannot currently be dissolved through diet.
Once present, they generally need to be physically removed or dealt with using an appropriate veterinary procedure. Nutrition then becomes particularly important in managing and reducing the risk or rate of recurrence.
Dogs with calcium oxalate stones may also be investigated for underlying conditions that increase urinary calcium excretion, including:
Hypercalcaemia
Hyperparathyroidism
Hyperadrenocorticism
Calcium oxalate stones have a frustrating tendency to recur, which means ongoing veterinary monitoring is important.
Which dogs are more prone to calcium oxalate stones?
Breeds commonly affected include:
Miniature Schnauzers
Bichon Frises
Yorkshire Terriers
Shih Tzus
Lhasa Apsos
Chihuahuas
They are particularly common in middle-aged to older dogs and are frequently seen in males.
Should you remove calcium from a dog's diet?
No — and this is a brilliant example of why DIY dietary manipulation can backfire.
Calcium oxalate contains the word calcium, so understandably owners sometimes assume the answer is to dramatically restrict calcium.
But dietary calcium can bind oxalate within the gastrointestinal tract.
If dietary calcium becomes too low, more oxalate can potentially be absorbed.
UC Davis specifically warns that reducing dietary calcium to very low levels can actually increase oxalate absorption.
Read more: UC Davis School of Veterinary Medicine – Nutritional Management of Uroliths.
The nutritional strategy instead needs to consider the whole diet, including water intake, urine concentration, mineral intake and the dog's wider health.
3. Urate stones in dogs
Urate stones are particularly well recognised in Dalmatians, which have a genetic difference affecting uric acid metabolism.
Other dogs can develop urate stones too, and they may occur in association with congenital liver abnormalities such as portosystemic shunts.
This means a dog developing urate stones without an obvious breed-associated reason may require further veterinary investigation.
Dietary management usually includes controlling the amount of purines being consumed.
Foods particularly rich in purines can include:
Liver
Kidney
Other organ meats
Sardines and certain fish
Some seafood
Meat extracts
Some yeast products
And this is where feeding style can become relevant.
A meat-heavy homemade or raw diet containing lots of organ meat may be a particularly poor choice for some dogs with urate stones.
It doesn't become medically appropriate simply because the ingredients are fresh.
4. Cystine stones in dogs
Cystine stones occur because affected dogs have an abnormality in the way their kidneys handle the amino acid cystine.
The condition is called cystinuria.
Cystine is relatively insoluble, so when sufficiently high amounts are excreted into the urine, crystals and stones can develop.
There is a strong genetic component, and cystine stones are seen particularly in younger intact male dogs.
Affected breeds include English Bulldogs, French Bulldogs, Mastiffs and Newfoundlands, among others.
Some forms of cystinuria are influenced by male hormones, meaning neutering may form part of the veterinary management plan.
Nutritional management can include controlling protein intake, increasing water intake and manipulating the urinary environment.
Again, this is very different from simply choosing a food based on whether it is raw, fresh or kibble.
Water and bladder stones in dogs
One of the themes you'll see repeatedly across urinary nutrition is water.
Urine becomes more concentrated when less water is being excreted.
And when urine is highly concentrated, substances involved in stone formation are more concentrated too.
This is why encouraging a greater urine volume is an important part of managing many stone-forming dogs.
Ways of increasing overall water intake can include:
Feeding an appropriate wet diet
Adding water to food where appropriate
Providing multiple clean water bowls
Refreshing water frequently
Trying a drinking fountain
Encouraging regular toilet opportunities
UC Davis describes increasing water intake as an important strategy in the nutritional management of uroliths.
But here's an important distinction:
Kibble does not automatically dehydrate a healthy dog.
Dogs eating dry food generally compensate for the lower moisture content of their food by drinking more water.
I explore that in much more detail here:
Does Kibble Make Dogs Dehydrated? Understanding Hydration in Dogs
Wet food can, however, be genuinely useful when increasing overall dietary moisture is part of a dog's medical management.
You can read more about the differences between feeding formats here:
Dry Food vs Wet Food for Dogs: Which Is Better?
Why fresh feeding might not be the best option for a dog with bladder stones
This is where we need to separate feeding beliefs and methods from nutritional therapy.
There is nothing inherently medicinal about a food being fresh.
Fresh describes a feeding format. It doesn't tell us whether that diet is appropriate for a particular disease.
A fresh diet can be wonderfully formulated.
It can also be poorly formulated.
It can be appropriate for one dog and entirely inappropriate for another.
The same applies to wet food, kibble, raw food and home-cooked diets.
Your dog's bladder doesn't know whether dinner came out of a tin, a bag, a plastic tray or your slow cooker.
What matters physiologically includes things such as:
Mineral intake
Purine intake
Protein and amino acid intake
Water consumption
Urinary concentration
Urinary pH
The number of stone-forming compounds being excreted
This is why the question shouldn't be:
“What feeding method looks healthiest?”
It should be:
“What nutritional composition does this particular dog require?”
What about homemade fresh diets for bladder stones?
A home-cooked diet isn't automatically unsuitable either.
In some circumstances, it may be possible to formulate a therapeutic cooked recipe around a dog's diagnosed urinary condition.
But there is a huge difference between:
“I feed my dog fresh meat, vegetables and rice because it looks healthy.”
and:
“This recipe has been specifically formulated around my dog's diagnosed stone type, calorie requirements, medical history and required nutritional targets.”
That distinction matters.
A generic fresh recipe could contain completely inappropriate quantities of individual nutrients for a stone-forming dog.
For example:
A high-meat recipe containing generous amounts of liver and kidney could be unsuitable for a dog requiring a low-purine diet for urate stones.
A homemade recipe containing large quantities of high-oxalate additions isn't automatically appropriate for a calcium oxalate former just because the ingredients are whole foods.
And continually adding meat, treats and homemade toppers to a prescription struvite dissolution diet may interfere with the controlled nutrient profile we're intentionally trying to create.
What foods should dogs with bladder stones avoid?
There isn't a universal list.
And that's perhaps the most important message in this entire article.
A dog with urate stones may require restriction of high-purine foods.
A dog with calcium oxalate stones needs a completely different strategy.
A dog with infection-induced struvite stones needs the urinary infection treated alongside appropriate dissolution therapy.
A dog with cystine stones has different requirements again.
So please be cautious about generic internet advice telling you to:
Remove all calcium
Remove all magnesium
Feed an extremely low-protein diet
Feed more organ meat
Remove all carbohydrates
Make your dog's urine more acidic
Make your dog's urine more alkaline
Give apple cider vinegar
Add cranberry supplements
Add urinary acidifiers
Switch automatically to raw
Switch automatically to fresh
Start multiple supplements
Trying to manipulate urinary pH yourself is particularly problematic. Different stones favour different urinary environments.
Making urine more acidic because somebody on Facebook says it prevents struvite may be entirely inappropriate if your dog is at risk of another stone type.
We need to know what we're treating before we start trying to treat it.
Does a veterinary urinary food have to be fed forever?
Not in every case
Again, this depends on the stone type, the reason it formed and the individual dog's recurrence risk.
For example, Merck notes that once infection-induced struvite stones and their associated infection have resolved, long-term dietary management isn't necessarily indicated.
Calcium oxalate stones, however, have a substantial recurrence problem, meaning long-term prevention and monitoring may be much more important. Dogs with genetic hyperuricosuria or cystinuria may require ongoing management because the underlying predisposition remains.
This is why I would always be wary of blanket statements such as:
“Dogs with bladder stones need this food for life.”
Some might.
Some might not.
The diagnosis matters.
How are bladder stones diagnosed?
Before making significant dietary changes, your veterinary team needs to establish what is actually happening.
Investigation might include:
Urinalysis
Urine culture
Blood tests
X-rays
Ultrasound
Analysis of stones that have been passed or removed
Investigation of possible underlying disease
Analysis of an actual stone gives particularly valuable information because its mineral composition can guide future prevention.
The Minnesota Urolith Center provides separate veterinary recommendations for calcium oxalate, struvite, urate, cystine and numerous other stone types – which again demonstrates why there isn't one generic “urinary diet”.
Minnesota Urolith Center – Canine Treatment Recommendations
Diet should have a purpose
Bladder stones are a brilliant example of why I don't rate diets simply according to how processed they are, how much meat appears on the label or whether the food is described as fresh, natural or human-grade.
A therapeutic food might not look terribly exciting to us.
But its purpose isn't to look pretty, appealing to human or to make a great photo.
Its purpose is to create a particular nutritional and urinary environment for a dog with a medical condition.
That doesn't mean every dog with bladder stones needs a prescription kibble.
It means that whatever we feed should have a nutritional rationale based on that individual dog's diagnosis.
The same principle applies when choosing any dog food: ingredients and marketing claims are only part of the picture.
You can read more about the questions I think owners should be asking when choosing food here:
What Should I Feed My Dog : The beginners guide to picking the right dog food
My dog has bladder stones – what should I do next?
Start with your vet rather than your dog's food bowl.
We need to understand:
What type of stone is present?
Is there a urinary infection?
Is there an underlying medical condition contributing to it?
Does the stone need dissolving, physically removing or monitoring?
What is the goal of the diet?
Once we know that, nutrition becomes much more useful.
What I wouldn't recommend is choosing a food simply because it says “urinary”, copying somebody else's feeding plan from a Facebook group or switching to fresh food because you've been told fresh is always healthier.
Therapeutic nutrition should have a purpose.
Need help with your dog's diet?
If your dog has been diagnosed with bladder stones, urinary crystals or recurrent urinary disease and you're struggling to understand what their diet should look like, this is something I can help with through a Health Condition Nutrition Consultation.
Alternatively if you are looking for a therapeutic home cooked diet you can consult with a board certified veterinary nutritionist. I do not formulate therapeutic home cooked diets for dogs
I can work alongside your veterinary team, review your dog's diagnosis, test results, medical history and current diet, and help establish how nutrition fits into their overall management plan.
Because when it comes to bladder stones, we're not looking for the food that sounds healthiest.
We're looking for the diet that's appropriate for that dog, that stone and that medical situation.
This article is for educational purposes only and does not replace veterinary diagnosis or treatment. Bladder stones can cause urinary obstruction and other serious complications. If your dog is repeatedly straining to urinate, unable to pass urine, appears painful or becomes unwell, seek veterinary attention urgently. Dietary changes for a dog with diagnosed urinary stones should be made in conjunction with their veterinary team and should take the type of stone and the dog's wider medical history into account.
