They can hold on for two-three days. If you're asking in the context of a cat who is straining to go to the toilet or only urinating small amounts you need to go to the vet ASAP as this can be a life threatening condition called Cystitis where crystals form in the bladder. This can … Read more

In all honesty, this is a question no one, not even vets can give you the answer to. Each case is different and they can go very quickly. A cat with renal failure can live for a few years, months or just weeks after being diagnosed. I've seen cats who appeared in better health than … Read more