My 3 yr old big black cat has suddenly become afraid of his own shadow. He plays with the dog, the 2 other cats, hangs in the barn with the 2 goats. He has never been social around strangers, LOVES me, loves my spousal unit, and likes our housesitter. But lately, he comes in the house, and jumps when he sees shoes, a new water bowl, even his own food bowl. So, it's "jump, crouch, sniff, look again, another crouch and sniff". Is he losing his mind? Is this normal? He recently had a full blood work up (songbird fever/salmonella, I am sorry to say), and he went through the full antibiotic treatment. Vet thinks he's OK. Just wondering if anyone else has experienced this.