So Woody (young adult boy cat) can almost touch noses when Dizzy (2.5 year old boy cat) jumps up on to the bed and there's no hissing.
(We've had Woody since he was a kitten and just got Dizzy two weeks ago. We also have a much older female cat who keeps things to herself but occasionally hisses at both and sometimes chased by Woody, but that's another story.)
They can also eat close to each other, when we feed them wet food close to each other.
But Woody will hiss at Dizzy when in close proximity at other times.
Also Dizzy can occasionally chase after Woody once he's been spooked by Dizzy.
We guess Woody must get frightened of Dizzy, hence the hissing.
Can anyone explain this behaviour ?