Q. Is it true to feed cats, esp. Males, less fish, esp. Tuna, to prevent "crystals" that can block urinary tract ?
LINDSEY EDWARDS MVB, BSC, IVCA
A. Just feeding less or no fish would not be sufficient to prevent crystals. A cats urine pH should naturally be acidic and a meat based diet, with or without fish is important for this, a plant or carbohydrate diet is more likely to be less acidic. It is vital to maximize your cats water intake if they have ever shown signs of cystitis/FLUTD and also to reduce/manage stress, encourage regular urination by having a number of cat litter trays, in suitable locations, with suitable litter - outdoor cats naturally urinate up to 8 times more often than indoor cats and urinary retention in the bladder encourages the minerals in the urine to crystalize and potentially cause problems
A. Crystals are caused by numerous factors including genetics, infection, urine pH, etc. Fish foods may be associated with crystals due to the phosphorus content but cats can still get crystals on chicken based diets. The best thing to do is to make sure your cat has adequate water intake.