Rodaidh is used as a stud dog for Hearing Dogs and it undoubtedly has affected his temperament, and working with our stud dogs every day as I do I would say that it is common to the vast majority of them. He's still absolutely wonderful with people, but not with other dogs. He has zero tolerance for puppies, even tiny ones, 'puppy licence' doesn't exist for him, or for any of our stud dogs really. I have to be extremely careful with him because he will flatten them if they get in his face, as puppies tend to do. He also has zero tolerance for other male dogs, especially bouncy young ones, and again he really will go for them and it's not just noise/handbags. He never starts it, he only reacts if they get in his face, and he always warns them first but when they inevitably don't listen to him and persist he'll hammer them. I have to be very careful with him around other dogs and it's not ideal at times when I'm hauling him away from some cute little 12 week old puppy or friendly young dog because he's about to flatten it

I can't have another male dog in the house, he will tolerate one of his own sons, Chester, who is also a HD stud dog and trained gundog that we go shooting with who stays with us when his fosterers are on holiday, but I don't leave the pair of them unattended. I run training classes for the HD breeding dogs and have to limit it to two stud dogs per class and keep them at opposite ends of the hall because there are some of them who will go for each other pretty much on sight, the Labs and Cockers are worse than the Poodles. Luckily for me Rodaidh has never started cocking his leg indoors and he doesn't mither after bitches but again, a lot of if not most of our stud dogs do, I've just been lucky with Ro on that score.
Would I do it again with another dog, I genuinely don't know. Before I even considered it they would obviously have to prove themselves to be worth using by either trialling or being an outstanding, proven working dog with the right attributes. The biggest question for me though is, is it worth changing the dog for? For Rodaidh it has been, he has sired some 12 litters now as part of a carefully planned and structured breeding programme and is Hearing Dogs' most successful stud dog ever in terms of pass rate for his offspring - Ro himself has had more assessments than I can count now and he consistently produces offspring of a very consistent type. They are being bred for a purpose and as well as HD 3 of his pups have been donated to South Wales Police and Stansted Airport Police and have all passed the relevant training and are working as sniffer/detection dogs. Several of them have been trained for gundog work by their fosterers also. If however it was the case that the dog was only going to be used a couple of times to breed litters for no particular purpose that couldn't be met by another established stud dog then for me it wouldn't be worth it; the disadvantages would outweigh letting him sire a couple of litters for the sake of it.