Signs Of Renal Failure In Cats

In the early stages, signs of renal failure in cats are very non-specific and can be difficult to distinguish from the general signs of ageing. Unlike dogs, in which an increased thirst (polydipsia) and increased urination (polyuria) are common, polydipsia/polyuria is only reported in 30 to 40 per cent of cats. The most common signs are dullness, anorexia, weight loss and halitosis. Halitosis is a useful indication of renal disease: however, it is also associated with dental disease which is very prevalent in older cats. Cats with renal failure will often have a poor hair coat and a stiff gait. Some cats will also vomit due to the build up of waste products within the blood stream. Occasionally, cats will present with sudden onset blindness associated with bleeding into the eye or retinal detachment as a result of hypertension. Hypertension is commonly associated with renal failure in cats.

Although the loss of the kidney's functional ability is a slow and gradual process, some cats seem to present with a very sudden onset of signs. It is likely that these cats have been coping (compensating) by an increase in fluid throughput, enabling them to excrete their waste products over a larger volume as they are no longer able to concentrate their urine adequately. Eventually a threshold is reached when they are no longer able to compensate and clinical signs appear suddenly. The deterioration may be triggered by a relatively minor event such as a short period of starvation or vomiting which causes mild dehydration and the diseased kidneys are unable to cope.

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