SHARED on 18 Jul, 2020
Cronulla Veterinary Clinic
37 Kingsway
Cronulla NSW 2230 AU
02 9527 2604

FLUTD Feline Lower Urinary Tract Disease CVC

Feline lower urinary tract disease (FLUTD)

Failure to urinate or passing little urine can be a sign of a urethral obstruction and is a veterinary emergency.


FLUTD refers to a range of disorders that lead to difficulty in urinating. FLUTD is more commonly seen in cats older than 4 years of age and rarely diagnosed in young cats. Cats with chronic kidney disease or diabetes seem to be more predisposed to the condition.

Risk factors for FLUTD:

  • Genetics
  • Stress
  • Environmental changes such as living conditions or litter tray situation
  • Multi-cat households
  • Overweight cats or lack of exercise
  • Nutritional such as dry-only diets
  • Old-age
  • Breed
  • Gender


Common signs of FLUTD:

  • Drinking more
  • Urinating more
  • Blood in urine
  • Straining to urinate
  • Urinating outside the litter box
  • Pain on urinating
  • Excessive licking of genitals


Common causes of FLUTD:

  • Bladder infection (cystitis) including Feline idiopathic cystitis (FIC)
  • Bladder crystal or stones or plugs
  • Cancer
  • Trauma
  • Incontinence

Age seems to play a role in the cause of FLUTD in cats with cats greater than 10 years of age often having more straightforward cases than younger cats.

Top causes of FLUTD in older cats  Top causes of FLUTD in younger cats

Bacterial infection






As there are many different causes for lower urinary tract disease, we need to determine the cause to be able to treat appropriately. Some of the causes are:

Cystitis & FIC

Cystitis often occurs on and off resolving without treatment within 3-5 days. It is estimated that over 50% of cats that suffer from FLUTD have cystitis with feline idiopathic cystitis thought to be the most common cause of FLUTD in cats.

Bladder crystals or stones

Bladder crystals and stones are also commonly occurring in approximately 20% of cases. The most common types are struvite or calcium oxalate and can cause blockage of the urethra, especially in male cats. This is an emergency situation and needs veterinary attention a.s.a.p.

Urinary tract cancer

Only 1-5% of cats will have urinary tract cancer.


Only 1-5% of cats will have problems relating to trauma such as being hit by a car.


A full workup is required to determine the cause of the urinary system problem. We will usually start with checking your cat's urine in our clinic, but other urine tests may also be needed, including microscopic cytology and culture and sensitivity testing. Depending on the findings we may also need to run a blood panel, and imaging such as radiographs or ultrasound to determine the cause.

Bringing in a fresh urine sample can be very helpful for your veterinarian.

Tips on how to collect a urine sample at home:

  • Always provide a fresh urine sample to avoid contamination and changes
  • Consider refrigeration as a last resort if the sample cannot be fresh, and bring this in on the same day as collected
  • Use a very clean container such as an unused plastic cup to collect the sample
  • Clean the litter tray, place non-absorbent litter and lock your cat in a room until it urinates
  • Record the time of day the urine was collected

Sometimes, we will need to keep your cat in hospital to collect a sterile urine sample.


The goal of treatment, depending on the findings, is to increase water consumption, reduce stress, manage the infection and crystals, and reduce pain.

Management of FLUTD:

  • Removal of any stress factors
  • Dietary management to control the urine pH, minimize crystal formation, reduce inflammation and increase urine volume
  • Veterinary diets to help dissolve the crystals
  • Some of our veterinary diets can even help with stress related FLUTD symptoms
  • Increasing water intake by feeding tinned food or adding water to dry food
  • Surgical removal of crystals/stones in severe cases
  • Veterinary pain management with non steroidal anti-inflammatories may be needed from time to time. To assess the safety blood tests may be needed as well.
  • Behavior medications in cases of more severe stress may be needed

Unfortunately, some cats will experience frequent recurrences of FLUTD. Careful, long-term monitoring is required in these cases.

Litter tray management

  • Keep the litter tray clean daily

  • Clean the litter tray every week with warm soapy water

  • Keep enough litter trays per household cats e.g. minimum 1 litter tray per cat plus one extra
  • Try different litter trays such as open, covered, deep, or shallow
  • Adequate litter tray size e.g. 1.5 times the length of the cat

  • Keep litter trays in a low traffic area
  • Keep litter trays away from food and water bowls
  • Identify litter dislikes. A happy cat will dig into the litter for more than 4 seconds
  • Desex all cats
  • Prevent access or view of outside stray cats (to reduce stress)
  • Use good quality litter such as soft, unscented clumping litter
  • Ensure the litter depth is at least 4cm or 2 inches deep


Tips to help prevent FLUTD:

  • Feed smaller amounts of food more frequently (2-3 meals a day)
  • Feed tinned food as hydration is very important
  • Feeding diets high in Omega 3 fatty acids to help reduce bladder wall inflammation
  • Offer water flavored with low-salt tuna or chicken broth
  • Some cats prefer their water boiled then cooled down to reduce the chlorine levels
  • Some cats prefer running water (e.g. a dripping tap or a water fountain)
  • Change the water bowl to a shallow, wide bowl as cats do not like their whiskers touching the bowl sides or water fountains
  • Consider a veterinary prescription diet specific to the type of urinary tract problem
  • Provide regular, fresh water at all times in multiple bowls around the home
  • Reduce stress by providing scratching poles, elevated resting perches, food contraptions, and feeding in a stress-free environment


Kruger JM, Osborne CA, Goyal SM, et al. Clinical evaluation of cats with lower urinary tract disease. J Am Vet Med Assoc 1991; 199: 211-216.

Longstaff L, Gruffydd-Jones TJ, Buffington CT, et al. Owner-reported lower urinary tract signs in a cohort of young cats. Journal of Feline Medicine and Surgery 2017; 19:609-618.

Gerber B, Eichenberger S and Reusch CE. Guarded long-term prognosis in male cats with urethral obstruction. J Feline Med Surg 2008; 10: 16-23.

Cooper ES, Owens TJ, Chew DJ, et al. A protocol for managing urethral obstruction in male cats without urethral catheterization. Journal of the American Veterinary Medical Association 2010; 237: 1261-1266.

Buffington CA, Blaisdell JL, Binns SP, Jr., et al. Decreased urine glycosaminoglycan excretion in cats with interstitial cystitis. J Urol 1996; 155: 1801-1804.

Lavelle JP, Meyers SA, Ruiz WG, et al. Urothelial pathophysiological changes in feline interstitial cystitis: a human model. American Journal of Physiology-Renal Physiology 2000; 278: F540-F553.

Westropp JL, Welk KA and Buffington CA. Small adrenal glands in cats with feline interstitial cystitis. J Urol 2003; 170: 2494-2497.

Markwell PJ, Buffington CA, Chew DJ, et al. Clinical evaluation of commercially available urinary acidification diets in the management of idiopathic cystitis in cats. JAm Vet Med Assoc 1999; 214: 361-365.