I have a 9 week old Chi/Pom puppy. He had his first set of shots at exactly 9 weeks (two nights ago). The next morning (yesterday) I started to deworm him, just in case. I am using SafeGuard deworming powder mixed in his food. I noticed that yesterday and today, about one hour after his deworming meal, his right eye half closed. It looks a little watery but no puss or anything. It seems to go away after another hour or two. Could this be a reaction to the medicine? Should I discontinue use? Or is it possible that its just an allergy? He doesnt seem to be itching or anything else. Can I use human eye drops?