We have 2 cats, one about 8-9 years old, very big (named squeaky) and one about 3-4 much smaller (names Felix). The big one loves just me and is very kind to only me. The smaller one is soooo nice and has always been nice to everyone, you can hold him and practically do whatever. I am the only one who can hold the big one. The little one has always antagonized Squeaky but he just hisses and has never harmed him at all. When about 3-4 weeks ago, Felix, the little one attacked me for no reason. I had bites and scratches up & down my legs. He has been fine since and back to his old kind demeanor. Well today, he attacked again, the same way. We think we need to get rid of him and I don't want this to happen to another family so I will be truthful at the shelter. I was just wondering why after 3-4 years he would turn like this. They are both house cats and have all there shots. Any insight??