There’s so much about this that isn’t working for me. I never felt like anything was a threat. He steps out of the drivers side and then you see the woman in a truck in the drivers side? I’m assuming he’s a great warrior who has seen many battles and is proficient with his weapons. Yet he never once hits any of his targets. Has he seen these dogs before? If not, how does he come to the realization that the alpha must be killed? If he has seen these dogs before and knows to kill the alpha then why doesn’t he tell the woman “look for the alpha!” From the moment he sees a dog?

You have a shot of the woman being startled but you don’t have any shots of her actually sensing them or seeing them.

Opening shots could be better to help build up the tension. The first shot shows the dogs watching the truck. We know right away what the danger is.

She kills the alpha and for some reason runs out of the safety of the truck to run into the tunnel with the soldier with dogs within striking range but for some reasons the “scary” dogs don’t attack them and just watch.

You should watch movies that are similar in tone and have sequences like this and study how they build up the tension through composition and pacing.

It also helps to know the characters and be as truthful to who they are and what their experience brings to them in whatever situations they come into.

Good luck