Yes, it is Fear-Aggression that Spike has, and I am aware of that. The thing is, I need tips on how to correct it. So far I learned that toys should be taken away at the end of playtime, to make it so the dog cannot become territorial over toys, and to praise him often, in order to build of confidence in the dog. Because of that, I feel I should begin a daily training and rewarding ritual, so as he learns commands, he is praised and rewarded. I think that can help build up confidence. My family and I have had dogs all our lives, even my parents, but the thing is, oddly, Spike is the first male dog, not to mention the first aggressive one that we have had. We don't lock him away when we have guests, but we have one person hold him, while the guest hold out his/her hand so he can sniff them, and if he seems accepting, they pet him and it seems to work to an extent. For whatever reason, he particularly doesn't like men. He isn't neutered, and since we are financially struggling, we are trying our best to save enough to get that done. As a puppy, Spike was extremely cowardly, and cried and whined and hid from everyone new to him, loud noises, other animals, besides his siblings and mother, and most things new to him. We tried to comfort him, but the cowardly nature only became fearful aggression. He is not abused, he is not neglected, and he has only been in one dog fight, to which he started with a neighbor's dog, and we were able to safely separate the two of them, without there being any casualties. I think these things will help. Do you guys have any other tips however??"

Also, being blunt is acceptable, because honesty is blunt, and I can take any tips you have without anger or irritation. So if you don't think I want to hear your ideas, because you think you'll be too blunt, you don't need to worry about it.

Thanks to anyone who offers advice!!!