Our cat is 17 years old and has had a healthy life so far. However, in the last few months he has started urinating on carpets etc in the house (specific places rather than all over). This has never been an issue before. He is very skinny and, despite asking for food often, rarely finishes his bowl. His stomach is notably swollen. Clearly he needs to see a vet and will do but so I can mentally prepare myself and the kids, am I right in thinking we have a big issue here?