I let my chin out for playtime today and he started making a weird squeaking sound and bringing his paws to his mouth as though he was choking on something. I examined his mouth and he seemed to be okay and started running around again. He continues repeating the behavior every now and then as he runs around. I know he's not choking because he happily accepted a treat from me. So could it be possible he's simple sneezing? Is this normal behavior, or could it be a cold or something?