I have a kitty cat (actually he is 3 years old now) that I originally broght home from the local shelter. He was only 5 weeks old. Even at that age, he was agressive to other animals. I figured he was so agressive due to possibly having problems when he was with his mommy (she was killed but not told how...maybe another animal??) As he has grown he has gotten worse. He is nuetered and very loving to me, however, he has even begun to hiss at people. He still goes berserk at other animals, cats in particular but if he is not allowed to go the stranger, he will hiss at them. I realize this is probably due to fear on his part and tell everyone to just let him come to them and to just ignore him for while until he is comfortable with them. I have a male friend that he is friendly with mostly but at times, my cat will for no known (to us at least) reason, hiss at him. What could be the problem? A stray (male) cat came to my door and I hand carried it to the yard and when Spooner (he is an indoor cat) smelled the strange cat on me, he hissed and I thought he was going to attack me. I quickly got scent of other cat off me. How can I help him? Thanks.