Sanman, that's the thing about great bred family dogs bred like you say for years and years. When bred like that and bred true without any penmanship being done in how they are bred along the way. Those types of family dogs presents and traits will be felt for gens and gens. I know of bulldogs that where born back in the 60's that where bred true to form up till this day and let me tell you there is Damn near clones being born till this day of the dogs they bred back then. Color, build, ability and everything else they ain't lost a Damn thing! But let me tell you along the way there where SELECTED CROSSES bred only when needed and then straight back to the family they went. Regardless what's on paper when you get faimlys that are worth their salt for 50 years and still producing like day one and all the Vigor is still there you can bet your sweet behind they didn't just get that way from never making a cross some where along the was.....Hell even a dumb Ass Scientist genealogist will tell us this. Lol
Thank You for putting this the way you did, when people here the word outcross they immediately jump to the train of thought that you just watered your blood down, outcrosses are needed to maintain the longevity of the line, it can be from another tight bred family of dogs that have the same style your dogs have and your not losing nothing, if you sit in the same batch of tubwater long enough it's going to get cold, you either add more hot water or keep it cold. Not trying to sound like a smart as$ by no means, but for those of you who have never dabbled in the bulldog game have got to understand that those types of dogs have been bred for a long long time and have maintained true to form more so than just about any other type of working dog in the world, due solely to sound breeding practices, so something their doing is working, it just seems to me that some can't seem to understand a bulldog or old bulldog mans way of doing things when it comes to breeding dogs versus a man who is breeding hunting dogs.