This is normal cat behavior, attempting to show who's in charge of the place.
Hissing is to be expected; discourage swatting, but if the cat hisses, let him
hiss.

It's also recommended that when you introduce a new cat into a household, you
spend a lot of time petting the old cats in the presence of the new one, paying
as much attention to them as you can. This calms them down and helps them
understand that they're not being outsourced.

jms

(jmsatb5@aol.com)
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