Struvite Crystals in Cats: Causes, Diet and Prevention

In this guide

Struvite crystals are one of the most common urinary issues Indian vets see in cats, particularly in cats that eat mostly dry food. Understanding why they form makes the dietary advice that follows a diagnosis much easier to stick to.

What struvite crystals actually are

Struvite, also called magnesium ammonium phosphate, is a mineral that occurs naturally in small amounts in healthy cat urine. Problems start when the urine becomes too concentrated and too alkaline, allowing these minerals to crystallise and clump together, sometimes forming larger bladder stones or a sludge that can block the urinary tract, particularly in male cats.

What increases the risk

• A diet that is mostly or entirely dry kibble, since this provides far less moisture than wet food
• Chronic mild dehydration, which concentrates the urine
• Urine with a consistently alkaline pH
• Being overweight or leading a largely sedentary indoor life
• Stress, which is increasingly recognised as a contributing factor in feline urinary problems generally

Symptoms

• Straining or spending a long time in the litter tray
• Frequent, small amounts of urine
• Blood in the urine
• Urinating outside the litter tray
• In male cats, a complete inability to urinate is a life threatening emergency and needs immediate veterinary care

Diet and management

Most struvite crystals can be dissolved through diet alone, using a prescription urinary dissolution food that adjusts urine pH and dilutes the minerals responsible. This only works if the cat eats nothing else during the treatment period, since even small amounts of regular food or treats can undermine the diet's effect. Once dissolved, many vets move the cat onto a maintenance urinary diet long term to reduce the chance of recurrence, alongside encouraging more water intake through wet food, fountains and multiple water stations around the home.

A note for owners feeding home cooked meals

Home cooked diets heavy in fish, organ meat or bone can carry higher mineral loads than a balanced commercial diet, which may add to the risk in cats already prone to crystals. If your cat has been diagnosed with struvite crystals and eats mostly home food, it is worth discussing the recipe with your vet rather than assuming a natural diet is automatically safer. As mentioned in relation to hydration generally, hard tap water common in many Indian cities can also add to the mineral load, so filtered or RO water is worth considering for cats prone to urinary issues.

Article content © Ravi Teja. All rights reserved.