I have 4 cats (all neutered/spayed). 12YO male, 8YO male, and two 3YO females. I have had one of the females for four months. We have dealt with introducing new cats into the pack before, but this time, our 8YO male is not adapting to our new 3YO. Every time she is within 3 feet of him he hisses and growls, sometimes even getting into fights. The other two have pretty much accepted her with only a few dominance growls here and there. The 8YO is also starting to go after the other two, I think in misplaced aggression. Any ideas as to why he's behaving like this?
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