Alphas are typically the lorgest and physically stronger of the three dynamics. They tend to be aggressive, territorial, and protective. The scent of an omega in heat can often set them off on their rut which just makes them want to [bass boosted danny devito voice] fuck.

Generally, a healthy alpha has a rut about once every month or so (this can vary depending on your worldbuilding. Here, it's every month, like a menstrual cycle). The rut is a period of highly hormone-driven sexual excitement where the alpha is motivated to bite, claim, fuck, etc. - very primal behavior. If the alpha has a pack, they will typically spend their rut with their pack. Lots of messy group sex. Yummy.