UPDATE
Roscoe is doing great! The swelling is almost completely gone, he is eating well, playful, and the wound is nice and clean/scabbed over.
I was waiting to see how he was this morning to decide what our move would be, but he seems to be back to normal with just a tiny bit of swelling...
I have an outside dog named Roscoe. He is a boxer/pitbull mix. Yesterday we noticed one side of his face was swollen (about the size of a grapefruit). He was in pain, so I gave him an aspirin (safe for dog consumption). Last night, I checked in again, and noticed it was now an open wound and the...