My cat is an inside/outside cat. He will get very aggressive if he is not let outside at least one to two times a day We have been letting him outside for about 5 years now. We always wondered why he was so aggressive the first few years of his life, as the vet told us to let him outside every so often. He usually comes back but on Tuesday he did not and still hasn't. I miss my baby, if you know anything or have seen him please call my number.