We adopted a new cat three months ago, and slowly introduced them over the course of three weeks. They play fight a lot, bite each other, scream, yowl, and chase- then calm down and lay around, and follow each other. However, my resident cat (2 years old) no longer plays with us. He used to play fetch, now he just watches it roll until the new cat (1 year old) grabs it. He hardly shows interest in playing with his old toys, and when he does the new cat distracts him and he gives up. The only thing he still enjoys is catnip. Also, he had never been a hisser, and just today I couldn't tell if he was hissing at me, the cat, or the carpet sprinkle I was putting down. He has become more aloof and I miss him. Please help me get my baby back!