Just thought I'd mention, the cat with HIV. If we'd found out earlier that he's been positive (it's very rare so they don't test for it as a rule and only did in the end because they'd run every other test they could) we would have had to make the decision over whether to make him an indoor cat or euthanise him when he was still perfectly healthy. Pretty selfish, but both my mum and I are glad it wasn't known: neither of us could have faced letting him out with other cats with the possibility he might pass it to one of them (rare, but happens enough for the vet to REQUEST you never let your cat out again), nor could we have coped with making him miserable for the rest of his days - he was a real outdoor cat.