When you breed your dog does it change their personallity at all?

I have thought about breeding a little bit but my husband doesn't like the idea. He thinks it will make the dog act different. I wouldn't want to breed him more than once either. I would only do it once and get on of the babies out of the litter for a friend for him other than our great dane. Is it a good idea? Is it a bad idea? Is it unfair for the dog?
What can you tell me???