...and he always has been. But more in an attention grabbing way. A week or 2 ago, he started creeping about the house, looking not so sure of himself. Hiding behind the washing machine. Tonight, I stood on MCat's tail, drawing forth a screechy complaint noise from MCat. Little Monsieur dashed in from the garden, to check on his big bro, who he adores. Since then, he's sequestered himself behind the washing machine (again), only venturing out to fall into the bath. (While I was in it, he can creep like a Ninja.)
Cat flap locked from 7pm, so no other cats getting in to freak him out. He doesn't leave the yard.
He's due for his boosters this week, and I'm pretty sure (from experience) if I relay all this out of sorts behaviour to the vet they'll say they can't diagnose a problem, if any, without actual physical symptoms - such as discharge from orifices etc.
Any ideas?