would you breed from a stud dog whose litter brother started epileptic fits? No other siblings or parents have suffered from it. Any thoughts?

I would want to know if there was any trauma the dog had suffered which could have brought the fits on.

Depends on the breed, the stud and the line. All things being equal my answer would be no but if the breed is of small numbers and the stud or his line have attributes that are not readily available within the breed then like everything else to do with responsible breeding you have to weigh pros with cons and make sure the bitch has a totally clear line from any kind of fit be it epilepsy or any other, epilepsy being difficult to diagnose with any real certainty.

I would want to know more about the background of the fits. I know of one dog that didn't fit until he received his boosters. He was fine up until then. Trauma of one sort or another is also a possible cause. If there is no other dog in the lines that is epileptic then I would consider it.

Edited to add: How many dogs go into pet homes where there is no further contact with the breeder? At least you are aware of the problem so it wouldn't be bolt out of the blue if there was a problem in the future.

> I know of one dog that didn't fit until he received his boosters. He was fine up until then.

In that instance I still would not want to use that line as it could indicate that the dog has a greater susceptibility to be affected by a particular medication. 
People sometimes claim that certain breeds or lines are more often affected by certain medication and perhaps breeding from individuals like this has led to that happening.  Trauma due to impact for instance could be different but all in all best not to even if you think you have an explanation as you don't really know.

AND Also does anyone know of any correlation between "fitting" and canine herpes virus?

> AND Also does anyone know of any correlation between "fitting" and canine herpes virus?

NO, I don't Sam, would be surprised it there were a connection to true epilepsy but there could be with idiopathic fitting (idiopathic epilepsy) I suppose but the hereditary factor has only been proven in a few breeds and we do not know the breed concerned here.

ok can I take this another stage please? If you bred a litter and then when they were a couple of weeks old it was discovered the father was fitting.....what would you do ? Ethically, morally and legally re these puppies?

Oh Sam, so much depends on the circumstances of the fitting, the dogs past health and if there has been any trauma, have any investigations been done to try and find out why the sire is fitting, if so the results.

Do not think the breeder of the pups can do anything until they know as much as possible about the cause of the fitting, they can only tell the prospective puppy purchasers what they know and the purchasers will have to decided for themselves. Would be wise to get the puppy people to sign to say they have been informed of the fitting and will be advised if the cause is discovered.

The only other option is to cull the pups but that seems drastic until the true cause of the fitting is known, if it ever is.