Hi all, My cat is 19 years old and blind. Over the last 6 months she's been using her litter tray less and less. I don't know if her being blind is causing confusion or whether it may just be her age. I have taken her to the vet's and they couldn't find anything immediately wrong with her, they said they could do blood tests. She was traumatized by the trip to the vet's. She's always been a house cat. Has anyone any thoughts before I take her for a blood test? I'd rather avoid putting her through more stress but I'm running out of options. I tried a bigger litter tray and one with lower sides but neither has helped. She doesn't seem to struggle getting in or out and the tray has been in the same place for years (since before she went blind).