Is breeding harmful?

[symondneil]

I have been asked a buddy of mine if he could use my dog as a stud. But them I was told that it will cause harm to your dog if you don't continue to use him for that. They said it causes some kind of anal problems. Does anybody know if this is true? I was cosidering getting him fixed but if he could breed and not be harmed by it, then I would maybe re-consider.