Urinary Health of Cats
While attending trade shows we have spoken to many cat guardians. One alarming fact is that regardless of the kind of diet cats have (meat- or plant-based) a lot of people have cats with urinary health issues. According to Nationwide, provider of insurance for pets, the #1 illness for all cats is FLUTD1 - 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. As a result of these findings, we decided to write about this topic in greater detail, while paying 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.
Image 1. Feline Urinary System - Male and Female
The most frequently cited cause of urinary tract disease is improper hydration3, 4. In the US 2/5 of all food that is fed to cats is wet food, while the remaining majority (about 3/5)2 is dry food. Since cats get water 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 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 wall, often 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. 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.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 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. 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 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 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, etc.)
- Monitor pH at your vet, or at home with strips or by using a special pH litter that changes color
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 RetrievedOct 18, 2016
2 Cat Food Sales in USA 2000-2014 https://www.statista.com/statistics/197950/symphonyiri-tracked-dollar-sales-of-cat-food-in-the-us/ RetrievedOct 18, 2016
3 Feline Urinary Tract Health: Cystitis, Urethral Obstruction, Urinary Tract Infection, Lisa A. Pierson, DVM http://www.catinfo.org/?link=urinarytracthealth RetrievedOct 19, 2016
4 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.
|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|
|Nutritional Yeast 'Cheesy Chic'n' flavour - used to enhance the flavour of cat food. Cats go crazy about it!|
The contents of this 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.