Dog’s aggressive recently

Ive got 4 huskies, 2 older, 2 younger. The two younger ones are about 2-3 years old and they are unfixed, not by choice and that will be the first step taken to try to resolve this issue. But they have become very aggressive the past few days fighting each other and going after both of the older ones, including injuring one of their ears. This has happened once in the past but they only went after one of our older girls and then it didn't happen for a long time, almost a year. So I was wondering if anybody has insight into why this would be happening. I know theres a good chance that it's them not being fixed which they now have appointments for. All 4 dogs are female too