Urinary Health of Cats

According to Nationwide, pet insurance agency, the #1 illness for cats is FLUTD1Feline Lower Urinary Tract Disease. Much like diabetes and heart disease are the leading illnesses in humans, urinary health issues are the leading illnesses in cats. This article is pays particular attention to the urinary health of cats with regards to plant-based diets.

With the lower tract urinary disease, the urinary bladder and the urethra (see diagram below) are affected the most.

Feline Urinary System - Male and Female

Image 1. Feline Urinary System - Male and Female

The most frequently cited cause of urinary tract disease is improper hydration3, 4. In Canada, 1/3 of all food that is fed to cats is wet food, while the remaining majority (about 2/3)2 is dry food. Since cats get water from their food, when the food is dry, they are likely not getting enough water.

Urinary Health of Cats - Hydration main contributor to health A cat's normal prey is ~70% water. Dry food is ~5-10% water. Canned food is ~78% water. Cats have a low thirst drive and they do not make up the deficit at the water bowl. They are designed to get water with their food.3




As a result of dry-fed diets, many cats have urinary health issues, which fall under the umbrella of FLUTD, including cytitis and urethra obstruction, both of which are very painful pathologies.

  • Cystitis (bladder inflammation)
    • Cystitis occurs in the urinary bladder (a muscular sac, that receives and holds the urine until discharged - see Image 1)
    • Cystitis is an inflammation of the bladder walloften linked to stress and the highly concentrated urine that results from being fed a water-depleted (dry food) diet.3 
  • Urethra obstruction
    • The urethra is a tube that drains urine from the bladder (see Image 1)
    • Urethra obstruction is when the tube is blocked by an inflammation material - mucus, crystals, and/or small stones (called calculi) that have formed in the kidneys and have passed down into the bladder
    • Urethra obstruction is an extremely painful condition that predominantly occurs in male cats because male urethra is more narrow than that of female cats
  • Urinary Tract Infection (UTI)
      • UT Infections can occur anywhere along urinary tract
      • UTI's are caused by bacteria
      • UTI's are relatively rare (accounting for 1-5% of FLUTD)5
      • UTI's are usually treated with antibiotics (to fight the bacteria)

    How do you know that your cat might be experiencing cystitis or urethra obstruction or UTI? There are a number of symptoms that suggest your cat might be in trouble:

    • Straining to urinate - with or without production of urine

    • Frequent trips to the litter box - with or without production of urine

    • If you are using clumping litter, cats with cystitis will often have many small urine balls (small clumps) in the litter box
    • Crying while urinating

    • Excessive licking of the genital area

    • Blood in the urine

    • Urinating in places other than in the litter box

    • Posturing (squatting) in the litter box for a long period of time  (Note that sometimes people think that their cat is constipated when he/she is really showing signs of a lower urinary tract problem.)

    If you see any of the symptoms you should consult your vet right away.

    In most cases these conditions are preventable and the most effective prevention is to provide adequate hydration for your cat. Other factors, such as stress and low activity levels, contribute to problems with the urinary tract. However, improper hydration is the main contributor.

    We know that bladders are 'happier' with more water flowing through them, which helps to flush out debris (mucus, cells, crystals) and keep the urine diluted. Diluted urine is thought to be less irritating to the bladder wall. Therefore, we see far more cases of cystitis in dry food-fed cats than in cats eating canned food. 3

    Providing adequate hydration is, however, easier said than done. If you just put a bowl of water in front of your cats, they will not necessarily drink enough water. Unlike dogs (who happily drink water), cats get most of their water from food. Therefore, give your cat moist canned food, which usually contains 75-78% moisture. Unfortunately, canned food is more expensive. So as an alternative, you can give your cat dry kibble, and add water (preferably distilled) to dry kibble with 1:1 ratio. For example, for every 1 cup of dry kibble, provide 1 cup of water. Let the food soak in the water for half an hour and then give it to your cat. The soaked kibble becomes 55% moisture, which is much better than the 10% moisture originally found in dry kibble. If your cat is picky, then add nutritional yeast to moisten food. Also, cat water fountains entice some cats to drink more water. Another alternative is to add fresh/pureed veggies to increase moisture content of dry kibble while also adding whole-food nutrients to the meals.

    Another factor that contributes to the urinary health of cats is the pH of their urine. pH is the measurement of how acidic or alkaline urine is.

    Image 2. The pH scale

    The normal pH for cat urine is in the range of 6.0 - 6.5. A lower number indicates more acidity, whereas a higher number points to greater alkalinity in the urine. A plant-based diet contributes to making a cat's urine more alkaline, which in turn can lead to the formation of struvite crystals (a mixture of magnesium, ammonium, and phosphate), which in turn can lead to urethra obstruction. To bring urine pH back to normal, cats (especially male cats) need to be supplemented with acidifiers, which dissolve the struvite crystals. Most popular vegan dry kibbles (Evolution Diet and Ami) are supplied with ingredients like dl Methionine and other ingredients to help keep acidity in the 6.0 - 6.5 range. Other example of acidifiers are cranberries (cranberry powder), vitamin C and sodium bisulfate. Sodium bisulfate is used in VegeCat Phi, the supplement for home-made meals designed for cats with urinary health complications. VegeYeast with pH of 3.5-3.7 can also be used as an acidifier. Acidifiers can be given to cats to decrease the pH of their urine to make it more acidic, this will re-establish the 6.0 - 6.5 pH range.

    Image 3. The effect of plant-based diets and acidifiers on cat's urine should. The pH of the urine should be in 6.0 - 6.5 range.

    A word of caution: the acidifiers should be given in moderation. Providing too much may lead to overly acidic urine, which can create another kind of crystal called calcium oxalate. These crystals can remain small and harmless, or they can grow large and lead to urethra obstruction and other complications. So it is very important to keep the pH level in 6.0 - 6.5 range.

    There are several ways to monitor the pH of your cat's urine. This can be tested by a vet, who would provide the most accurate results (compared to other methods). However, visits to the vet can be quite expensive, because there is the cost of the visit in addition to the cost of the test. Monitoring pH on an ongoing basis with the vet might be cost-prohibitive. Another option is to have pH tested at home with either pH strips or a special litter (limited accuracy) that changes colour according to urine's acidity. These solutions are not perfect because they have limited accuracy, but they do provide cat owners with some sense of pH.

    We recommend measuring the pH of urine prior to the transition to a plant-based diet (to establish the baseline for comparison) and then 1 month after the transition (to see what effect the new diet has on the pH). We also recommend checking the pH of urine every 2-3 months after that.

    We realize that many readers have tried measuring the pH of urine for their cats and we are curious to learn what challenges this process brings up. Please post your comments below to share your experiences.

    The Bottom Line:

    • Urinary health issues are very common in cats (#1 illness)
    • The primary cause of urinary issues is inadequate hydration
    • Urinary problems are preventable with proper hydration
      • Feed cats moist food either from cans, or by soaking dry kibble in water
      • Use cat water fountain
      • Add fresh/pureed veggies to cat's meals
    • Urine pH must be kept in the range of 6.0 - 6.5 to avoid formation of crystals
      • Plant-based diets tend to make urine more alkaline and this must be monitored. For example with CheckUp kit for Cats or CheckUp kit for Dogs
      • Vegan cats may need additional acidifiers (examples - cranberry powder, vitamin C, VegeCat Phi, VegeYeast)

      For more articles from Vecado sign up to our newsletter.



      1 Top 10 Most Common Dog and Cat Ailments Revealed, PRNewswire, Mar 29, 2016, http://www.prnewswire.com/news-releases/top-10-most-common-dog-and-cat-ailments-revealed-300242164.html Retrieved Oct 18, 2016

      2 Pet Food Sales in Canada May 2016 http://www.agr.gc.ca/resources/prod/Internet-Internet/MISB-DGSIM/ATS-SEA/PDF/6747-eng.pdf  Retrieved Oct 18, 2016

      3 Feline Urinary Tract Health: Cystitis, Urethral Obstruction, Urinary Tract Infection, Lisa A. Pierson, DVM http://www.catinfo.org/?link=urinarytracthealth Retrieved Oct 19, 2016

      Cornell University College of Veterinary Medicine, Bladder and Kidney Stones, http://www.vet.cornell.edu/fhc/health_information/BladderandKidneyStones.cfm Retrieved Oct 23, 2016

      5 James Kyffin BVSc (Hons) MRCVS. "Stress and FLUTD". Retrieved Oct 25, 2016.


      Related Products

      Product Description
      CheckUp Kit for cats - CheckUp Kit helps monitor the pH of urine, detect the most common issues among domestic cats including high glucose levelskidney failureurinary tract infection (UTI), and blood in the urine.
      CheckUp Kit for Dogs - CheckUp Kit helps monitor the pH of urine, detect the most common issues among domestic dogs including high glucose levelskidney failureurinary tract infection (UTI), and blood in the urine.
      Moist Food in Cans Moist Food in Cans - used to provide adequate hydration, which in turn helps avoid urinary tract issues, and to ensure that Urine Specific Gravity stays at normal levels
      Cranberry Treats - used as acidifier to dissolve struvite crystal and to lower pH; also used as a delicious cat treat
      VegeCat - used as a supplement for vegan home-made meals; contains an acidifier Sodium Bisulfate, which helps making alkaline urine more acidic
      Nutritional Yeast 'Cheesy Chic'n' flavour - used to enhance the flavour of cat food. Cats go crazy about it!
      VegeYeast - used to enhance the flavour as well as to acidify the food to make alkaline urine more acidic


      Disclaimer Notice

      The contents of the vecado.ca website and blog, such as text, graphics, images, and other material contained on this site ("Content") are for informational purposes only. The Content is not intended to be a substitute for professional veterinarian advice, diagnosis, or treatment. Always seek the advice of your veterinarian with any questions you may have regarding the medical condition of your pet. Never disregard professional advice or delay in seeking it because of something you have read on this website! Reliance on any information appearing on this website is entirely at your own risk.


      • Robert

        At the end of the article mentioning pH strips: Please edit the article to advise to NOT check urine pH from the litter box, because that gives inaccurate results, because it sometimes will be reading the pH of the litter itself.

      • Eric Weisman

        We add 1 part Distilled Water to 1 Part Evolution Dry Kibble Food and let the hydrated food ferment in a refrigerated sealed container for at least 16-24 hours before serving. When Evolution Dry Kibble Food is hydrated, it ferments and offers many of the same benefits of Raw Food with probiotic bacteria formation & Vitamin MK 7 K2 formation which strengthens teeth, bones, Red Blood Cell Formation and immune systems of Cats and Dogs much like Vitamin D. We always use Distilled Water for Cats & Dogs, because it is much cleaner & safer than Tap or Filtered Water. Distilled Water also acts like a cleaning machine in Dog-Cat Bodies & Organs and helps remove disease causing entities through the Urinary and Intestinal tracts of Pets much like it does in Humans. Most important is that Distilled Water is pure Water and does not contain added chemicals or pathogens that may harm your Cat, Dog or Human for that matter.
        We add a small amount of dry kibble to our moistened Evolution Food to help clean and strengthen teeth at every meal for Cats & Dogs. For every 2 Lbs of Moist Food we add 1 heaping tsp of Fresh Ground Whole Flax Seed to the food for added Omega 3 Fatty Acid which prevents inflammation inside Cats & Dogs.
        Fresh Whole Organic Flax Seed is very important for health of Cats & Dogs. Neve use pre-ground Flax Seed because it is oxidized and does not have the Omega 3 benefit that Fresh Ground Flax Seed has.
        I also add 1 heaping tsp Vitamin C Powder to each 2 Lb. of Dry Kibble Food to bolster the Membrane & Connective Tissue Strength, Immune System, prevention of oxidation, and as a urinary tract acidifier to prevent infection and blockage of the Urinary Tract. Cranberry Capsule Powder in the amount of 4200 Mg per 2 Lb of Evolution Kibble Dry Food is also excellent for the purpose of protecting the UT from infection, but Cats & Dogs are always best eating moist Foods in any event, especially when the Dry Foods are fermented in the refrigerator in a sealed container for 16-24 hrs before serving. Add Nutritional Yeast, Vegan Parmesan Cheese, Vegan Sour Cream or Evolution Add-On Flavors for best taste results. We also add fresh shredded Organic Carrot, Organic Beet and Kale to our Cat & Dog foods for added nutritional & taste benefit. YUM!

      • Carmen

        Thanks for this very informative (and well-cited) article.

        My cat Griffin also had urinary problems late last year/earlier this year and we couldn’t figure out why. It could’ve been behavioural (as we had another cat living with us at the time, and Griffin was also newly adopted), or it could’ve been health-related. It was probably a mixture of both: he was, and is, on a dry-kibble only diet, and from emailing Vecado I realized he could’ve been dehydrated! So I started adding water to his food, and he really did stop urinating (fingers crossed it doesn’t happen again).

        However, as any cat owner will realize, cats don’t display symptoms until things are REALLY bad. My friend went on vacation and moved her cat, who was perfectly normal and fine, to her friend’s place. Once there, the cat had blood in its urine! They went to the vet and discovered it had some very severe kidney stones.

        That being said, cats seem to have high tolerance of FLUTD. I’m actually worried Griffin might have some degree of FLUTD as well, because (as indicated in this article), he does frequently urinate, and urinates small urine balls, and spends quite a while in the litter box. I’ve been wanting to try the pH strips, but I’m not familiar with the logistics of it. I’m curious of the experiences of other cat owners as well!

      Leave a comment

      Please note, comments must be approved before they are published