We moved house a couple of months ago with our two cats. At first we had the stress howling though the night, which we expected, and then the howling to go out, which we also expected. They've been going out for 3 or 4 weeks now and while one of them has settled in no problem, the older cat (he's 6 years old) just doesn't seem himself. Husband says he is just taking longer to settle, but over the past week or so he seems to have got worse - he isn't really interested in going out, he is howling for attention all the time, he is overeating and then vomiting, he seems agitated and is stress-grooming.
Thing is - at our old house he wasn't a stressed cat at all - he was really laid back and took everything in his stride - visitors, trips to the vet, new kitten - no problem.
Is he just taking longer to settle or could there be another cause?