Of course, I don't go for > the more aggressive breeds generally - we typically have had hunting > dogs, mixes of various hunting dog heritages, and general purpose > mutts.
I do think this has some bearing on the issue. There are some breeds that are more dog aggressive than others. We have tried to keep two unneutered male dobes together and there was just no way it was going to work and we have had lots and lots of experience with dogs. Neutering early is key also. Our male we have now is the least dog aggressive we have ever had but we didn't show him so we neutered him early and did lots of early socialization with big groups of dogs. All that being said, we had a friend that raised Rotties and would have 3-4 unneutered male Rotties at her place running lose all the time. There was no doubt, though, that she was head dog - she kept a tight rein on things. -- Laree in NC Doppa & Mura Simon, Sadie and Sam (the "S" gang) "Yet when all the books have been read and reread, it boils down to the horse, his human companion, and what goes on between them." - William Farley