Ah, I've lived with them all my life. My family already had a red and white dog called Jim when I was born. He was never keen on us kids and didn't allow us or strangers to touch him. We learnt a lot of respect for dogs from him. He growled at us if we got too close but never bit us. He was a working strain dog.
I was just a baby when my dad bought a black and white bitch and called her Jess. We also had a terrier mix at the time who was older than me but younger than Jim. When I was 4, my dad bred from the terrier and kept two of her sons. They were awful with other dogs and always wanted to fight. One got knocked down by a car and killed when he was 8. The other lived to 15. Their mother lived to 17 but would have lasted longer had we not had her pts because she was just not "living" anymore.
When I was coming up for 10, our old jess had one last litter. Yes, she was too old but I was only a kid and she only had two pups anyway which made it easier. Two sons. One of them we kept and called him Monty. A few years later when I turned 13, I got another working strain black and white bitch as a bday present to replace the terrier that had been knocked over the previous year and also to replace our old Jess who had to be pts about a month beforehand. I called my new dog Mist. When she was old enough, we bred her to Monty and kept a daughter who I named after our Old Jess, her grandmother.
Monty passed on a few years ago and Mist in January this year so there is only our Jess now.
Still, my dad has a red and white bitch called Jen and also has a daughter of hers, a tric-colour, sired by our Monty.

We've had other dogs such as GSDs, whippet, the terriers and now my dad has greyhounds but the borders were always best. I'll never change breed.