I don't use animal names because they're incorrect. Horse (she) is yin. Horse (he) is yang. For this type of animal. But in general, yang fire in the earthly branches is the bull. This corresponds to the energy of the sun at its zenith. The bull lifts its prey up on its horns. This symbolizes the sun's zenith. Accordingly, all animals are: tiger (he), rabbit (she), dragon (he), snake (she), bull (he), goat (she), monkey (he), chicken (she), dog (he), pig (she), rat (he), cow (she).
Why is it important to correctly understand animal energy? It's a reflection of the interaction of the elements in earthly life. And the very characteristics of this energy. Yang fire interacts with yang water. Either the bull will trample the rat, or the rat will bite off the bull's legs. At the same time, the bull's energy itself is an all-consuming animal power of mass and strength. Its entire appearance is frightening. And rats are. At first, he competes with his fellow rats for a place in the hierarchy. And he may even eat other rats. A rat's full power is invisible. But when engaged, he can defeat an opponent many times his size. His strength is reckless because he has no escape route.
A proper understanding of the energy of the earthly branches is the foundation for understanding the processes within the elements. And the interactions between the elements. Because the current animal world was created by the same Gods who govern everything.