Yes I did. What I did was keep Topper separate in his room all by himself for a little over a month. During this time I was also using Feliway and Flower Essences (multi cat household in food for both cats). When that time frame was up, I would let them in the room with each other but only while I was still in there. He just gets this look in his eye like he is hunting and then he will pounce. But I usually pick him up before he has the chance. He especially does not like Shadow to eat, even though they have separate feeding stations. Shadow has not hissed at him lately but he did hiss this morning. Last night I had them both in the bed with me before I went to sleep just to see how they would act. Shadow just ignores him, he just wants to sleep. THen Topper tried to pounce him but I intercepted, picked him up, told him he was a bad kitty and put him out of the room and shut the door. I just don't know what to do at this point. Sometimes Topper could care less about Shadow (usually when he is tired). It seems as though when I play with him it gets him all excited and then he thinks Shadow wants to play too, or I don't know if he is pouncing to be mean or b/c he wants to play?