We have two rescue Persians, both about 12. One is healthy and happy. The other has always been tiny and sickly. We tried everything to get her to gain weight but nothing works, all food seems to make her ill. We had lots of tests done when we got her 5 years ago, but no conclusive results that there's anything wrong with her. She has always pooed on the floor, now she's weeing too. We dealt with it while DS was learning to crawl/walk but now DD is reaching that age and the mess has got worse. We tried feliway and multiple litter trays etc.
She doesn't clean herself but we did take her to a groomer. They can't groom her anymore because her skin is too thin and last time they cut her quite badly by mistake. She also broke her leg recently and hasn't quite recovered from that.
DH thinks we should have her put down and I think I agree. I know it's bad to come on here looking for reassurance that it's the right decision - it's our responsibility to decide. Our last cat had to put down because she suddenly became very ill - it was the only thing we could do. This cat is different, there's nothing seriously wrong, just a general accumulation of things that will only get worse. how do I know when it's the right time?