I have three dogs, two of which are fairly young and last night decided to go on an all night rampage, God knows where. After two hours, we finally gave up looking for them, assuming they'd come home. They did, at about midnight, when I was asleep - my dad brought them in. This morning, I let them out and went to class, came back a couple hours later and went to go check on them; and Katie was sprawled out on the ground, not responding to my calling her. She finally got up and walked over (she usually bounds up and down and runs in circles, really goofy dog) and I noticed her right eye was swollen halfway shut and there was a little mucus build up. There's no other injuries, so I brought her up, put a cold washcloth on it for a few minutes and let her into the garage to rest in the dark. What else should I do?