Mary, why is he so thin? It is just how he has ages, or does he have a thyroid issue? Those are common in older cats (as you probably know).

Friend of mine recently adopted a 10 y.o. dog from the shelter where she volunteers. For months, he was acting weird, spinning in circles, wandering the house and calling. The THIRD vet decided to do blood work; THYROID! Third day on the meds, he settled right down to be a lovely older pup! She's had him 4 months now, and only been able to sleep for the past week or so. Her husband was going nuts!

So perhaps, you thinking he is missing Pidge all this time is not it? Just a thought.