I have 2 cats ( a 3 and 4 year old-male and female). Last month we brought home a 9 week old kitten of a different breed. He is very playful and "terrorizes" the other cats. A couple of days ago I noticed that the male resident cat is becoming increasingly aggressive towards his "sister". They got along very well before new kitten arrival. The resident male tolerates the new kitten (sometime he plays with him but not for long), the female hisses but mostly ignores him. Should I be worry about the 2. I need some advice, please.
By Vali T.
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