My yorkie/pom mix, 1 year old, 3 pounds, has been squinting today. He seems to be having a hard time keeping his left eye open. He was playing pretty hard with my other two dogs this morning (both in the 10 pound range), so I don't know if something happened. Do you think this requires a vet visit asap or wait and see what happens? I did rinse his face with water thinking maybe something was in it, but I didn't see anything. Any ideas?