Here, I'll make a stab at bringing it back to the original...
Johnny Sack would be one of those grizzled and surly Tomcats you see prowling about with one ear half ripped off - usually a grey cat with white mittens and cutesy name like Bootsie - but just as likely to slice your nice off as look at you.
I think Dr. melfi or Meowfi would be one of those sxy new designer cats that looks like a tiger.. say maybe the Toyger or a Mau (the ones with big ears and spots)