Cloudy, Crystallized, or Green Dog Urine: What It Means

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-03

Cloudy, crystallized, or green urine in dogs usually points to one of three things: normal sediment that concentrates in a cool sample, crystals and stones forming in the urinary tract, or an infection or other condition changing the urine's color and content. A single odd-looking sample is not a diagnosis, but it is a good reason to collect a fresh sample and have your veterinarian look at it. This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

• Cloudy urine often means sediment, cells, crystals, or mucus is present. It can be harmless or a sign of infection or stones, so it needs a urine test to sort out.
• Crystals you can see (or that your vet finds on a slide) are called crystalluria. Crystalluria does not always mean stones are present, but stones are a common reason crystals keep showing up [1].
• Green urine is uncommon and usually reflects something else in the urine, such as an infection, a medication, or a dye. It should be checked instead of watched at home.
• Collect a fresh, midstream sample in a clean container and keep it cool if you can, then call your vet. Old or refrigerated samples can form crystals that were not there in your dog.
• Any dog that cannot urinate, strains with nothing coming out, or seems painful and bloated needs emergency care right away.

What Cloudy, Crystallized, and Green Dog Urine Actually Looks Like

Normal dog urine

Healthy dog urine is usually clear to slightly cloudy and ranges from pale yellow to amber. The color depends on how concentrated the urine is, which tracks with how much your dog drinks. The urinary system filters waste, balances water and electrolytes, and helps regulate blood pressure and blood cell production, so urine is a window into several body systems at once [2].

A little cloudiness in a sample that has sat out is common. As urine cools, normal minerals can settle out and form crystals that were not present in your dog's bladder. That is one reason your veterinarian wants a fresh sample when possible.

What owners notice

Owners often describe one of these patterns:

• Dog pee looks cloudy. The sample is hazy, milky, or has visible particles floating in it.
• Dog pee looks crystallized. You may see grit, sand-like specks, or a sparkly film in the sample or on the grass.
• Dog pee looks green. The color is greenish, yellow-green, or has a green tint.

Each pattern has a different list of likely causes, and the pattern alone does not tell you which one your dog has.

Main Causes of Cloudy, Crystallized, or Green Dog Urine

Crystals and stones

Crystalluria means crystals are forming in the urine. Stones, also called uroliths, are the solid version of the same process. Struvite and calcium oxalate are the two most common stone types in dogs [3]. Stones can form even when the usual chemical factors (urine pH, mineral levels, infection) do not fully explain them, and immune cells called neutrophils appear to play a role by releasing structures that help crystals clump and grow [3].

Crystals and stones often travel together. In one group of dogs with a liver condition called primary portal vein hypoplasia, every dog with stones also had crystalluria, and most of those crystals were ammonium biurate [1]. That is a specific situation, but it shows the general rule: when stones are present, crystals usually are too.

Stone type matters for treatment. Calcium oxalate stones tend to be very dense on x-rays and often have a bumpy or spiky shape, while struvite stones tend to be larger [4]. Struvite stones can sometimes be dissolved with a special diet and antibiotics instead of surgery, and in one small group of dogs, complete dissolution happened in 9 of 13 dogs treated that way [5].

Infection and inflammation

Most urinary infections in dogs are bacterial. Bacteria usually enter through the urethra, travel to the bladder, and can move up to the kidneys [6]. Risk goes up when the bladder does not empty fully, when urine is very dilute, when there is sugar in the urine (often a sign of diabetes), or when the immune system is weakened. Female dogs get urinary tract infections more often than males, while older uncastrated males are prone to prostate infections [6].

Infection is not the only cause of cloudy urine. Fungal cystitis can do it too. In one reported case, a dog with diabetes and pancreatitis developed cloudy urine and was found to have fungal balls in the bladder caused by Candida albicans [7]. That is rare, but it is a reminder that cloudy urine has more than one possible cause.

Inflammation without infection also matters. Pyuria means white blood cells are present in the urine. In dogs with bladder cancer, having pyuria at diagnosis and repeated episodes of pyuria were linked to shorter survival times [8]. That does not mean every dog with white blood cells in the urine has cancer. It means persistent inflammation deserves a real workup.

Color changes

Green urine is not a classic sign of any one condition, and the cause is not always obvious. It can come from infection, from something your dog ate or took, or from a dye used in a test. Because green urine is uncommon, it is best checked instead of guessed at. If your dog is also drinking and urinating more than usual, that combination has its own list of causes worth reviewing in Dog Urinating a Lot and Drinking a Lot: What It Could Mean.

Red Flags That Mean Emergency Care Now

Call an emergency clinic immediately if your dog:

• Tries to urinate and nothing comes out, or only drops come out
• Cries, whines, or strains while posturing to pee
• Has a hard, painful, bloated belly
• Collapses, vomits repeatedly, or seems suddenly very weak
• Cannot walk normally or seems disoriented

A complete blockage is life threatening within hours, especially in male dogs. Do not wait to see if it passes.

Call your veterinarian the same day if your dog:

• Has blood in the urine
• Pee is cloudy, green, or has visible grit and your dog also seems uncomfortable
• Is peeing in the house when previously reliable
• Is drinking and urinating far more than usual
• Has a known history of stones or crystals and new symptoms appear

If your dog is having accidents indoors, that alone is worth a call. There is a separate guide on Dog Peeing Inside that covers the behavior and medical angles.

What You Can Safely Do at Home While You Wait

You cannot treat crystals, stones, or infection at home. What you can do is gather good information and avoid making things worse.

Collect a sample the right way

• Use a clean, dry container. A new plastic food container or a clean ladle works.
• Catch urine midstream if you can. Let your dog start, then slide the container into the stream.
• Keep the sample cool. Put it in the refrigerator if you cannot get to the clinic within an hour.
• Label it with your dog's name and the time you collected it.
• Bring it in a sealed bag so it does not leak in your car.

If you cannot catch a sample, that is fine. Your veterinarian can often get one in the clinic.

Do not do these things

• Do not change your dog's diet to "dissolve" anything. Therapeutic urinary diets are prescription formulas, and using the wrong one for the wrong stone type can make things worse.
• Do not give human urinary pain relievers or antibiotics. Some are toxic to dogs, and the dose depends on your dog's weight and health. Your veterinarian calculates any medication dose for your pet.
• Do not withhold water. Dogs with urinary problems often need free access to water.
• Do not wait out a dog that cannot pee.

Do these things

• Offer plenty of fresh water.
• Take note of how often your dog pees, how much, and what it looks like.
• Write down any medications, supplements, or table food your dog has had.
• Take a photo of the urine color if it is unusual. Color in a photo is not perfect, but it helps.

What Your Veterinarian Will Check and Test

Your veterinarian will start with a history: how much your dog drinks, how often and how much it urinates, how the urine looks, behavior changes, medications, diet, weight changes, and past illnesses [9]. Then comes a physical exam, including feeling the bladder and, in males, the prostate.

Testing usually includes:

• Urinalysis. This checks color, concentration, pH, protein, glucose, and sediment. Crystals, cells, and bacteria show up here. For a deeper look at what those numbers mean, see Urinalysis for Dogs: Interpreting pH, Protein, Glucose and Specific Gravity.
• Urine culture. This identifies bacteria and which antibiotics will work. It is the standard way to confirm infection instead of guess.
• Blood work. This checks kidney values, blood sugar, and other clues to metabolic disease.
• Imaging. X-rays and ultrasound look for stones, bladder wall changes, and other problems. Stone density and shape on x-rays can hint at what the stone is made of [4].

If stones are found, treatment depends on type, size, and location. Some struvite stones can be dissolved with a prescription diet plus antibiotics, with imaging to confirm they are gone [5]. Others need surgery or a procedure to remove them.

Prevention and Monitoring

You cannot prevent every urinary problem, but you can lower the odds and catch issues earlier.

• Keep water available at all times. Good hydration keeps urine less concentrated.
• Offer frequent bathroom breaks. Holding urine for long stretches is not good for the bladder.
• Watch for changes. Cloudy urine, grit, accidents, or straining are early signals. Catching them early often means simpler treatment.
• Follow up on repeat problems. If your dog has had stones or crystals before, keep scheduled rechecks. Recurrence is common with urinary stones [3].
• Manage other conditions. Diabetes, Cushing disease, and kidney disease raise the risk of urinary infection [6]. Keeping those under control helps the bladder too.
• Ask about diet. If your dog has a stone history, your veterinarian may recommend a specific diet based on the stone type. Do not switch diets on your own.

If you notice eye discharge along with urinary changes, that is usually unrelated, but there is a separate guide on Dog Eye Discharge: Clear vs. Colored, What It Means if you want to check that sign too.

Limitations and When to Contact a Veterinarian

This article cannot tell you what is causing your dog's urine changes. Only a veterinarian who examines your dog and tests the urine can do that. Individual cases need individual evaluation.

Contact an emergency clinic right now if your dog cannot urinate, is straining with no urine produced, has a painful bloated belly, or is collapsing or vomiting.

Contact your veterinarian the same day if you see blood, green urine, visible grit, cloudy urine with discomfort, or a sudden increase in drinking and urinating.

Schedule a routine visit if the only change is mild cloudiness in a sample that sat out, with no other symptoms. Even then, mention it at your next appointment so it can be checked.

Frequently Asked Questions

Does cloudy urine always mean my dog has an infection?

No. Cloudy urine can come from normal sediment, cells, crystals, mucus, or infection. A urinalysis and often a urine culture are needed to tell the difference. If your dog seems uncomfortable or is urinating more often, call your vet.

Can I see dog pee crystals with my own eyes?

Sometimes. Larger crystals or clumps can look like grit or sand in the sample or on the grass. Many crystals are too small to see without a microscope, so a clear-looking sample does not rule out crystalluria. Your veterinarian confirms crystals on a urine sediment exam.

Is green urine in dogs an emergency?

Not always, but it should be checked. Green urine can come from infection, something your dog ate or took, or a dye used in testing. If your dog is also straining, vomiting, or acting painful, treat it as urgent and call right away.

Will changing my dog's food get rid of crystals?

Only if the diet matches the crystal or stone type, and that decision belongs to your veterinarian. Some struvite stones can be dissolved with a prescription urinary diet plus antibiotics, but the wrong diet for the wrong stone can cause harm. Never start a therapeutic diet without guidance.

How often should a dog with a stone history be rechecked?

Your veterinarian sets the schedule based on the stone type, how it was treated, and your dog's other conditions. Stones are common and often come back, so regular imaging and urine testing are usually part of the plan. Ask your vet what interval is right for your dog.

Related Articles

• Dog Eye Discharge: Clear vs. Colored, What It Means
• Urinalysis for Dogs: Interpreting pH, Protein, Glucose and Specific Gravity
• Dog Eye Goop Color
• Dog Peeing Inside
• Dog Urinating a Lot and Drinking a Lot: What It Could Mean
• Signs Of Uti In Dogs
• Dog Pee Color Chart: What Normal Urine Looks Like
• Cystine Crystals in Dog Urine: Causes and Diet
• Is Dog Urine Acidic or Alkaline? What pH Means for Health

References

1. Urolithiasis and crystalluria in dogs with primary portal vein hypoplasia: a retrospective study (2010-2023). The Journal of small animal practice, 2026.
2. The Urinary System of Dogs - Dog Owners. Merck Veterinary Manual.
3. Neutrophil Extracellular Traps Promote Urolithiasis Formation in Dogs: A Preliminary Study. Animals : an open access journal from MDPI, 2026.
4. In Vivo Radiographic Characteristics Associated With the Mineral Composition of Calcium Oxalate, Struvite, and Cystine Lower Urinary Tract Uroliths in Dogs. Journal of veterinary internal medicine, 2025.
5. Outcomes of medical dissolution for suspected struvite uroliths in dogs using a therapeutic multipurpose urinary diet and antimicrobial therapy. Journal of veterinary internal medicine, 2026.
6. Infectious Diseases of the Urinary System in Dogs - Dog Owners. Merck Veterinary Manual.
7. Successful treatment of Candida albicans-induced fungal cystitis in a dog using caspofungin: a case report. Veterinary research forum : an international quarterly journal, 2024.
8. Recurrent pyuria is associated with shorter progression-free survival in dogs with bladder urothelial carcinoma. American journal of veterinary research, 2026.
9. Detecting Disorders of the Kidneys and Urinary Tract in Dogs - Dog Owners. Merck Veterinary Manual.

Further Reading

• Merck Veterinary Manual: Dog Owners
• Cornell Richard P. Riney Canine Health Center: Canine Health Information
• American Veterinary Medical Association: Pet Care