Our cat acts the same way. Not sure why, but here to maybe get answers.
Jan 04, 2010 Rating
Check his thyroid by: Gwen
I have two cats, both quite old. The oldest one (almost 18) has had that same wacky behavior most of it's life but not daily, although often enough.
He has always been much thinner than my other cat, even though they have the exact same diet. Now the vet has discovered he has hypothyroidism and needs medication to control it for the rest of his life.
Maybe the weird chasing and sofa-attacking behavior has nothing to do with the thyroid condition; I never thought about a connection until I read your post. But the vet said he may have had hypothyroidism for many years since he was always so thin compared to my other cat.
