I agree that they must know something. When we have a vet appointment I take the carriers out and put them in the spare room a couple nights before we go and then hide them in the bathroom the morning of the visit, but they always hide. We have learned that who ever is going needs to be locked in their bedroom for easy snatching, but it is never easy.

Filou, you be a good boy! Glad to hear that he is doing better.