Hi Em, only one of my 3 boys is entire so can't answer your question from a personal point of view but a girl who I used to work with had a father and son, both of which were used as stud dogs, and they got on fine. I guess part of it must come down to the dog's in questions personalities and these two boys were the most laid-back cockers I think I'm ever going to come across :wink: But it will be interesting to hear some personal experiences on this matter and then you can weigh up the pros and cons.