What's wrong with my dog?

I have a 2 month old yorkie and a German shepherd. The two dogs were playing and then all of a sudden I heard a massive cry coming from my yorkie. His eye seemed to be sore at the start and was very closed. But gradually it is opening back up. Still looks a tad sore though. Since this happened this morning he hasn... show more I have a 2 month old yorkie and a German shepherd. The two dogs were playing and then all of a sudden I heard a massive cry coming from my yorkie. His eye seemed to be sore at the start and was very closed. But gradually it is opening back up. Still looks a tad sore though. Since this happened this morning he hasn t been himself. No energy, not his hyper self. Wont eat or drink and all he wants to do now is sleep. And he seems really nervous aswell which is a first. He seems to be able to walk ok and doesnt seem to have any pain bar his eye. Can someone please explain why hes like this?
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