Urinary Health of Cats and Effects of a Vegan Diet

According to Nationwide, provider of insurance for pets, the #1 illness for all cats is FLUTD - Feline 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 

With the lower tract urinary disease, the urinarybladder and the urethra are affected the most. 


Feline Urinary System - Male and Female 

The most frequently cited cause of urinary tract disease is improper hydration. Since cats naturally hydrate themselves from their food, when the food is dry, they are likely not getting enough water. 

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 evolved to get water with their food.  

As a result of dry-fed diets, many cats have urinary health issues, which fall under the umbrella of FLUTD, including cytitisand 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) 
  • Cystitis is an inflammation of the bladder wall, often linked to stress and the highly concentrated urine that results from being fed a water-depleted (dry food) diet. 
  • Urethra obstruction 
  • The urethra is a tube that drains urine from the bladder  
  • 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) 
  • 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 veterinarian 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. Dilute 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.  

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 moist 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. 


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. 

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 veterinarian, 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 that changes color 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 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, so vegan cats may need additional acidifiers (examples - cranberry powder, vitamin C, VegeCat Phi, VegeYeast) 
  • Monitor pH at your vet, or at home with strips or by using a special pH litter that changes colour 


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 

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 

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

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


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The contents of the 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. 


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