...The vet confirmed that he definitely belonged to someone as he had been chipped...
Did the veterinary clinic contact the company that registered the chip?
He humps like a beast!
Saxon, our king-sized Siamese, does this too. We asked about it at his recent yearly checkup and were told that it can occur if a tomcat was neutered well into adulthood, after having some breeding experience.
We haven't had any luck dissuading Saxon from doing this, but he has a split in one ear from our old female cat, possible from trying it with her one day when we were out. Our present female cat puts up with it with a bemused look on her face. I suspect that your Penny will let this cat know he's out of line, in which case you may be taking him back to the vet for stitches at some point. (What is he humping right now, if not your other cat?)
. He has scabs from what appears to be old injuries just below his ears and on his chest.
It could be from a fight. If the scabs are recent and haven't fallen off yet, they could be itchy because of healing underneath.
. However, he is not fond of being picked up
Maybe. Not every cat likes being picked up and not every cat is a lap cat. Only time will tell. When I had longhairs (not Persian, but with fur about as long) they weren't lap cats and I always suspected they just got too hot sitting right on top of us.
Are some cats just droolers
Maybe. Some male cats in particular will get so excited while purring that they drool everywhere.
In the beginning, he used to use the litter box and cover his poop but since the last 2-3 days he has not been covering it. We have also been letting the two cats interact more these past two days. Is it somehow related to that? A display of dominance?
Yes, dominant cats often don't cover their feces. Does he have a separate litter box from Penny? It may upset her to have some big male trying to dominate her using her litter box.
He eats everything in site!
Could be he's been roaming loose for a while and is just hungry - or he could be a bit of a piggy boy, as both my male cats (past and present) have been. We're always dragging Saxon away from the recycling box where he tries to kill the cardboard, styrofoam, and any crackly plastic. Hairballs are a definite possibility for a longhair that has been wandering for a little while.
I apologize in advance for the barrage of questions.
Well, that's what this site is for!