I have 2 siamese indoor cats, male & female, who have been raised together since birth. I've had them since 8 wks old. Yesterday the female saw a stray come to the front door and switched into attack mode. The stray was gone but then she turned all the aggression to my male siamese. Now they are hissing and can't stand each other. The male is in defense mode but the female won't calm down so he gets worked up. They have always loved each other. How could this happen?! Thanks for your comments and I appreciate any advice!

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