Bite wound not healing.

My dog was attacked on the weekend and had a puncture wound on her left shoulder. She went in to the vet who said that they were "the tip of the iceberg" and that there was likely damage underneath. We could opt to have him surgically inspect and drain the wound and repair any damage or take our chances and just take her home with antibiotics. Since we didn't really know what we were dealing with and she needed dentistry anyways, we opted to go with the surgery.

He found two other wounds and he said the muscle had been pretty badly torn.

Anyways...the part that I'm concerned about is that she now has gone from punctures to three 1.5 inch wide oval wounds about 1/4 inch deep (there's a layer of skin, what looks like sub-q fat or collagen, then the "muscle" is exposed). The vet has said to leave the wounds uncovered and simply soak them twice a day and treat them with neosporin. But it seems so counterintuitive to me to not use a gauze dressing.

I just wanted to get a second opinion. The only explanation or justification that the vet provided is "dogs are different than people" and that they do better when the wounds are managed this way.