You didn’t state in your letter whether or not your males are neutered, but if they are not, that could be the cause of such aggression. Especially when your female is in season, that can cause serious aggression issues in animals. Unless you plan on breeding your dogs, ALL of them need to be spayed and neutered. You will see a remarkable difference in your males as far as aggression goes, and if you spay your females you wont have to worry anymore. If money is an issue, there is an organization that sells discount spay and neuter services if you go to their recommended vets in your area. Their name is Friends of Animals Spay and Neuter Program. Google them. Once all your dogs are fixed, if his aggression doesn’t improve, then you need to look at what is happening in your household that could be causing this anger in him. Even if you have to have an animal behaviorist come in, you shouldn’t have to get rid of him just because he is having some issues with behavior.