My cat, who is normally quite vocal, is looking as if he is meowing, but no sound is coming out. He has just been under anaesthetic, having stitches in a nasty bite wound. He has definitely meowed since then (yesterday), but this evening isn't making a sound...I think he is upset at having to wear one of those lampshade colour things around his neck to stop him licking the wound and at being kept inside, but can cats lose their voice for a psychological reason?