Male dog why female dog fierce male dog fierce female dog what are the reasons

Why male dog fierce female dog male dog fierce female dog may be because of competition for food or territory, the dog is a very strong domain animal, so the male dog will be fierce female dog. The male dog may also be aggressive to the female dog because the male dog hates the female dog and is uncomfortable with the smell of the female dog, so he will be aggressive to the female dog. But sometimes the male dog fierce female dog is just playing, not really fighting with the female dog.