First of all, please be gentle with me- all of this started I think because I had a baby in October (now 13 weeks old) and I didn’t realise straight away as I felt like I’d been run over by a steamroller in the first 6 weeks with all night breastfeeding etc.
We have 2 British short hair sisters, 3 years old, had from kittens. R is very chilled and sleep is her favourite thing, while B is a bit more playful and runs around more, is more sociable with visitors, but can be a bit nervous.
DH took B to the vet in November as we thought she was looking a bit thinner and she had a big sore patch of skin under her front leg- must have taken us a while to spot it as quite hidden most of the time. Vet said she was a healthy weight (3 and a bit kg, forget exact figure) and R was overweight (4.5 kg) and gave us some antibiotic and steroid cream for the skin. All healed up fine and our minds had been put at rest about the weight.
Then just before Christmas we noticed some more smaller sore skin patches, which were healing well by themselves but obviously still worrying, and I saw her wee on a doormat near her litter tray, which is totally out of character. She did it a few tines then we took the mat away and I don’t think she’s weed there since.
I took her back to the vet, who did a blood test which all came back clear, and diagnosed idiopathic cystitis. She sent me off with a kit to take a urine sample, which came back with a small amount of blood but no crystals or anything else. She also prescribed metacam anti inflammatory, which lasted about a week. She didn’t say much about the skin, but it does seem a lot better now anyway with no new patches. Vet also said she had lost a tiny bit more weight- still not underweight, but the loss itself is worrying ( so annoyed first vet didn’t understand that!)
The vets advice was also to try a water fountain (bought one, although B already drank a lot from her bowl and the tap) and to put her back on wet food. We used to give both wet and dry food when they were kittens, but R had a skin reaction about 18 months ago and also used to have quite loose poo sometimes with blood. I stopped feeding them felix (awful stuff really) and put them on to various high quality dry foods, initially hypoallergenic as suggested by the vet after the skin reaction, but eventually worked out chicken was the culprit and switched to Canagan’s game flavour (no chicken and they both love it).
I have tried to feed B wet food again, but she turns her nose up, then R swoops in, gobbles it up and then we get runny poos again. I’ve ordered, at great expense, two cat feeders that recognise an individual cat’s microchip in the hope I can feed B wet food (not felix!) and R dry, but I’m worried they’ll both go on hunger strike when they realise what’s going on.
I’ve also this week got a feliway diffuser- has dismissed as no evidence they work, but I want to try everything that might help now, as I had thought B was getting better but she weed on the bed on Saturday; then she did it again just now. I was feeding DD in bed both times so I can’t help feeling it’s related. I feel so guilty now when I’m giving the baby attention when Dcat is there, and I don’t know what to do as I can’t have her weeing on the duvet ( and goodness knows where else I’ve not seen) but I’m so worried my feeding plans won’t work and she’ll starve herself.
Sorry this is so long- has anyone got through this with their cat, and if so what helped? Thank you for reading 
and apologies for typos- holding a baby with my other hand