If there's a chance that this is related to his being intact, I would neuter him. Why take a chance on his health just for the sake of bringing more puppies in to this world where so many are unwanted/neglected/abused everyday. Sadly, it's sometimes the "lucky" ones who end up euthanized.
"Obey my dog!" - Mugatu
"Who can believe that there is no soul behind those luminous eyes!" ~ Theophile Gautier
"Dogs are not our whole life, but they make our lives whole" - Ok... whoever said this has never had a sick or special needs baby. They ARE our whole life!
R.I.P. my sweet, handsome Thorin. You are missed dearly Dec. 25, 1999 - Mar. 4, 2012