Well that is a very hard question to answer it really really is. I know people that have done this maybe not with a particular gyp but I have know men that have bred four gens deep and have great great dogs threw out all of this . Then they get a wild hair and they go off and breed to this super bred stud that was really not proven proven just thought are hear say to be proven know what I mean . They are so wound up in the dogs great ped that they took the chance and five six years later are cleaning out their yards ! This is after they have done bred the bad gene pool threw out there yard making crosses and also family breedings. You do family breedings of this type your are threw it may not be till two years later are three but you can bet yo sweet tussy you are done !
Here's the kicker on all of this .
Yes you can breed to this dog to your proven great bred bitch and sure you are going to get some super dogs some great dogs you might not even have a cull in that first breeding . But here's the catch . You had all these good dogs in that liter so man you are on top of the world so then you breed some of these dogs across your yard well now again you might have a high percentage liter , then you breed those dogs and what happens





All the sudden out of no were !!!!!!!!!!!!!!!!!!!!!!!!!! You Percentages drop boom ten pups 6 culls 4 half ass dogs. You are saying wow must not have clicked this time . Then you are breeding to some more stuff from this dogs brother boom ten pups 8 culls 2 half ass dogs. All across the yard anything and everything with this Super Culls gene pool in there is now starting to react . Now you are saying what the hell and scratching your ass so you try another breeding with some more of this stuff that Super cull is in and bam man ten pups ten culls.
The deal is each time your bred those dogs with that Super Cull in there even tho you were having some good dogs at first those bad genes were double tripling and so on and so fourth now all the sudden this bad gene pool has over ridden the good genes from your good dogs and man o man one Super bred Cull screw up four gens of dogs .
How hard would this be to re coupe?

??
Almost impossible !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Haul you some dirt in there cause you ain't got nuff !