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This sounds like a very serious problem. It is not fair to be afraid of an animal you are responsible for especially when at other times he is a great pet. First you need to document everything that occurs around the time he attacks. Start by keeping a journal. If Dallas has not had full blood work and physical recently then he will need that. There is a diet you can ask your vet for that is specifically for cats with urinary problems and helps with stress. (ie royal canin calm/urinary or hills c/d stress). Then you need to seek out a veterinary behaviorist which will dissect and discuss options for your kitty. This likely means behavioral training and medications. There is usually a reason for a pet to attack and it is imperative that you work closely with someone to determine this so that you can work on stopping it. Secondly, if you can recognize signs that he is going to attack you might want to place him where he cannot hurt you. Unfortunately, euthanasia is also an option as if the attacking is not predictable and it decreases yours and Dallas's quality of life it would not be fair for both of you. Here is a website you help you find a behaviorist. http://www.dacvb.org/.