hi. my sister has 2 cats. one is a couple of years old and the other was introduced later. The first(Tasha) always treated the younger(Shiva) somewhat maternally. Shiva was spayed yesterday and upon returning home, Tasha hissed and acted aggressively. The two had never been seperated before, even for the few hours that it took. Tasha is still acting aggressive. Can anyone tell me why this is or what I should do about it? Will it pass with time?Any help would be greatly appreciated. Thank you.

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