Accidental breeding

I agree with Rueben here.

the theory is that it is a recessive trait because none of the parents have to display the trait to pass it on...but both parents will have to carry the bad gene or genes to produce a pup that will have it...and those genes have to match up so the chances are not that high to produce that trait...it is best not to breed a dog that displays that trait but since she is already bred it is not that bad of a deal...just cull them if one or 2 displays the trait...below I pasted where I got my info...off the net of course...

Rooster I know you proably don't want to hear this. I know those dogs of yours have been keep family bred for many many years on top of years. Like most great familys of dogs you breed in close then out some to the same family just dogs further back in the peds and it goes on for years on top of years like this with no problems . Then all the sudden you start to pop up with a dog like yours that has this out of the blue . Now am not at all saying this is the case with yours but you might want to look into it a little deeper as you breed. But what happens is the family is hard hard hard bred and if you go for enuff back in the peds you will see that for the most part they all go back to one are two dogs that your grandfathers used. They don't look to tight up front but once its all put together in the back people will be big time surprised at just the one are two dogs their bloodlines come from. If you start to notice dogs more and more having these problems what that is is Mother Nature telling you its time to freshen up that blood with a different bloodline then go right back to doing what your ancesters did for many many years . I know from experience that these family dogs such as yours they may seem like a big family of dogs but when you really look at it hard they have been kept in your family of people and when it all gets boiled down you run out of places to go and this is what many many bulldog man did we called breeding yourself in a corner . You just plain run out of fresh blood to breed to with these small families of dogs that's when it is up to the breeder to make the small change that is needed. If this ends up being the problem you might be having are starting to have. It may not even be that but its a good chance it might , I have seen it before and once refreshed its like a souped up chevy again and with no signs that you have done anything only the breeder knowing. This is what I have said many many times on here at some point a man has to go out to keep his line in tact and going at its strongest there is no way to just keep breeding a family of dogs over and over and over and over with out signs starting to pop up. May no be with yours I don't know but its something to look at closely . Hope I didn't step over the line just saying what I know .