my dog almost killed his son

They're probably fighting because of a "power struggle". Dogs are pack animals, and when there's more then one, someone has to be the leader of the pack-that's the alpha dog. And, it should be you(or your spouse), because you and your family members are part of the pack(in the dog's mind). It's like a hierarchy-the more powerful one is above the others. My mom's dogs, all females and not related went through this. When the oldest one was starting to show her age, the middle one started fighting with her for the food and water bowl-who got to eat/drink first. If your situation is that bad, it might be best to get rid of one of the dogs.

They're probably fighting because of a "power struggle". Dogs are pack animals, and when there's more then one, someone has to be the leader of the pack-that's the alpha dog. And, it should be you(or your spouse), because you and your family members are part of the pack(in the dog's mind). It's like a hierarchy-the more powerful one is above the others. My mom's dogs, all females and not related went through this. When the oldest one was starting to show her age, the middle one started fighting with her for the food and water bowl-who got to eat/drink first. If your situation is that bad, it might be best to get rid of one of the dogs.

he doesnt like your dog, maybe he is jealous of the dog. only thing i could think of is seperate the two.

take the son dog to a doctor and keep the father and son away from each other and then see the reaction of the father dog.

I don't think it's a good idea to keep them together unless you are there to monitor their every move. I had to keep my 2 dogs separate for awhile because of the fighting. They learned to get along somewhat, but every once in awhile they start up again. Good luck! Poor puppy.

Your dogs are fighting for their place in the pack. The older one has to keep showing that he's the strongest and the younger one keeps challenging him. One day, the older one will lose and the younger one will be the alpha. You can stop them from fighting by asserting yourself as the Alpha, but you will have to be firm and assertive all the time. Check out the following link - the guy is brilliant. http://www.dogpsychologycenter.com

Dogs do not distinguish between relatives or not especially if there is a female dog on heat.

I would say that you need to get rid of one of them or keep them seperate at all times. If they are both male - they might be fighting over who is the dominant one. If they are not fixed, you might try getting them both fixed - unless you are going to breed them both.

the dog is a he not a she.