Have you ever tried to change his food to see if he has any food allergies? Maybe if you tired to eleiminate things like grains and chicken to start off with and see if there is any improvement.
I would have the vet check the penis area and see whats up...it might not be an emergency but I would have it checked out.
Would love to see some pics if you would like to share! 
__________________
Tabitha April 10, 1995 - August 23, 2013
Bomber April 10, 1995 - July 12, 2010
Winston Nov 15, 1999 - September 15, 2011
Sophie Aug 30, 2011
"UNTIL ONE HAS LOVED AN ANIMAL, PART OF THEIR SOUL REMAINS UNAWAKENED"
He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion.
-Unknown
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