Hello Rob...nice to see someone who goes back to the original days of the old 'smoochers' getting on here.
Anyway, my bitch who weighs only eight pounds - yes really - is an out and out bayer, thankfully, but she is a quite nervy bitch and I believe character, as opposed to breed has much to do with the dog's working technique, irrespective of parent characteristics.
I have never bred a really hard Border, yet have owned a few; having said that, I've seen some really hard black dogs and never bred those either. I believe that working technique , ability etc differs across a litter as