"I think people often ignore training when they have small dogs. "It's tiny! It's not gonna kill you like the evil big dogs""
I think they must do/think like that - which is ludicrous in my opinion. My afore-mentioned grumpy lab/whippet cross was my 3rd birthday gift (I was desperate to have my own dog, having grown up surrounded by my parents and my grandparents dogs - so my godfather gave me the pick of his pedigree lab's unexpected litter... she'd escaped and gone wandering to a neighbour with a whippet's, whilst in season
) and from the moment she came into my life, I took to training her with gusto. Barbara Woodhouse's programmes used to coincide with my lunch when I was a toddler, and I was obsessed with having a well behaved, happy dog! Every afternoon, the pup and I were out in the garden, and I haphazardly trained her myself. It undoubtedly helped that my parents GSDs were also trained (my mother used to show the dog, and had been around breeders and trainers since she was a teenager, so in fairness, she knew her stuff), because they used to flatten my pup when she got too exuberant for her own good. They'd pin her to the ground with massive paws until she calmed down and remembered her place 
All of my dogs have been trained. Okay, so Woodhouse's methods are old-hat (and I no longer walk around yelling "sit!" and military style throwing hands in the air as I do so!), and I objected to the violence of the puppy classes my GSD and lab/whippet cross's puppies all went to (my mother kept one, I had one, and DB2 had one) and withdrew mine... but he was far better behaved than his brothers were. My GSD didn't need training, he just... did as I asked him to. My springer was trained to hand signals before verbal commands, but was obeying both without hesitation by the time he was 12 weeks old, and my little dog has a love of treats, and is willing to move the world on her back if it means she gets one
They're happy. They're not bored. They're loved. They know their place. And I know they'd cheerfully give their lives to protect my youngest child, so...!
We send our children to school so that they can learn, their minds can be stretched/expanded with new things, and their low boredom thresholds don't drive us insane. Yet so many dog owners don't understand that their dogs? Are just like small children. They need instruction, they need to be trained - for their safety as well as ours/others - and they also get very bored, very quickly. 