How long has it been since this has happened and how old his he? I am no means a vet but keep your eye on him and if you notice anything abnormal then take him on.Lilli had a concusion when she was about 6 months and that was the most terrible time of my life!!!!!!! My Yorkies are my world I feel the same why with them that a I do my son I would do anything for them I dont care how much money it would take My Son and my Yorkies are my world.And I will tell you the truth I was a cat lover until I met the bred Yorkshire Terrier! And I rescue anything if I see it on the side of the road its mine! I have always been a animal lover of all kinds I dont care what it is If it needs a home i have got it one