Quote Originally Posted by k9friend
What do you think about putting the new male cat and the existing female together in a large section of the house?
Well, they still need to get to know one another. Cats don't IMMEDIATELY like other cats (most of the time). Most people simply separate the newcomers in a bedroom, or other room with a door that can be closed. Then the new and the old will smell and sense each other and get used to the idea of OTHERS before meeting face to face.