I can't really contribute much to this thread as apart from my first dog (a cross cocker/labrador) I've always chosen my dogs and they have always been pedigreed and KC registered, and preferably line bred.
However, looking back, that first mongrel was probably what started my love of obedience. Susie was one of 7 pups born to my friend Angela's cocker spaniel, by next door's black lab - she and her family lived near my primary school and I was in every day looking at teh pups and playing with them as they grew. Angela's mum had said to her she had to help find homes as it was her leaving the garden gate open that caused them to be conceived.
So, at 10 years old with no concept of the responsibilities of owning a dog, I said that me and Angela would take one of the pups to my home to be my best friend. My mum said, it's too late to take her back at this time of night, so she can stay one night, then you'll take her right back to Angela's house. I was screaming with anger at my mum, as was my sister, My Dad was quiet - I clearly remember that. She was nicknamed Black Eyed Susie - her eyes were indeed very dark toning with her almost comepletly black coat.
Well you know how dogs work - they wriggle their way into everyones hearts.
My Dad had always wanted a dog unknown to me, and my sister and I just adored Susie from the start. Thinking back she was probably a little young to come away from her mum, but my Mum ensured she had milk daily, even in hard times, just after the war. Mum had been used to having a dog around as my Granda had a working springer (Major - my childhood guardian and best friend), so obviously knew the work and expense she was looking ahead to.
Dad became very attached to Susie and taught her many tricks, not just the lying down, playing dead, rolling over, giving paws, etc but also allowing our budgie, Nicky, to land on her head and to walk across in front of her hopping over her paws. I learned from him how to keep a dog focused and to do as commanded with love.
Unfortunately, Susie developed mammary tumours in middle age (about 9 or 10) as many spaniels do, and at the same time my Dad was in hospital following a burst appendix and peritonitis. He was very ill and was ther for months. He never got over not seeing her again after being discharged from hospital, and never had another dog
My next dog was a red cocker, from my husband's boss who was emigrating - 15 years after Susie died. She was KC registered, we mated her to her great uncle, a golden Show Champion, she had a lovely litter of 7 bitches, we registerd an affix and sold them to family homes, and the rest as they say is history