Will my 2 yr old cat get mad if I get a kitten

Keeping the new cat in a quiet, separate room is especially important if there are other cats in the house. The other cats will quickly become aware of your new cat's presence. The cats will usually sniff at each other under the closed door. Do not be surprised if there is some initial hissing. Help the cats get used to each other's scent by rubbing a towel over each of them in turn. Feeding them on either side of the door that closes off the room the new cat is in is also helpful. They will start associating the smell of the other cat with a good thing (food). After a few days, take the new cat out of its room, put the old cat in that room with the door closed, and let the new cat begin to explore the rest of the house for a few hours each evening.

The next step is to let the cats see each other, yet still keep them separated. An old screen door or a piece of Plexiglas works well for this. Another option is to prop open the door of the new cat's room, just enough so that the cats can see each other and put a paw through, but not enough that they can get through the door. After a few days of this, try feeding the cats together, but at opposite ends of the room. Monitor the cats during this time, and separate them except at mealtime. Each day, move the food dishes very slightly closer to each other, until the cats are eating side by side. The idea is for the cats to associate each other with the pleasant experience of eating. It is not unusual to hear occasional hissing, but this should decrease as the days go by. If things do not seem to be improving, try decreasing their interaction for a few days.