this is why there is shite about,i think this subject as been done many times,my opinion test the dogs you are going to breed from not one season,not 2 but several i would never breed a bitch till she had atleast 5 seasons behind her or the dog no matter how she is bred but thats only my opinion on the mattter,to much shite been thrown about by exactly doing this and you wonder why loads are looking for decent terriers rant over