On 2004-07-18, suitta wrote:
Our house cat was no
problem when we let the kitten in. Now, three day's later, he's been fixed
and tonight she's hissing and trying to smell his behind. She's shown
dominating actions since he came in, but nothing serious. Now, with the
hissing and agressiveness I'm afraid she may really mug him.

The surgical wound probably has triggered that behavior because it
smells like blood. You should keep them separated until the kitten
heals completely.