FWIW, I grew up around dogs and assumed I knew something about them. DDog came into my life and it rapidly turned out I knew fuck all. Everything I thought I knew had been handed down to me by my grandmother, who was born in the 1920s, and all of that had been handed down to her by her grandmother (born 1850s ish)... Nothing cruel, but in retrospect they were badly trained but go away with it because they were nice natured.
DDog came into my life accidentally (it's a long story) when I was in my mid-20s, newly single, and living in an inner London flatshare while working in an office full time - far from textbook circumstances. It also rapidly turned out that apart from being almost totally untrained, he had some significant behavioural issues - including turning around and trying to bite my legs every time he saw a trigger (he succeeded on a few occasions - luckily nothing that required stitches and nor did he go for third parties).
In the same way that parents who give birth to DC that turn out to have additional needs, you learn, because you have to, if you want your DC/DDog to have the best life available to them (and if you want your own life to be easier). Training (e.g. recall, sit, stay) is relatively easy to sort out, and with a lot of hard work and consistency, when DDog sees a trigger he now looks at me for a treat, instead of trying to bite my legs.
The knowledge that would have made my life easier, had I known it before accidentally acquiring DDog would have been
- canine body language - there's SO MUCH that we miss if we don't know what we're looking for. When I was young, anything less than a growl was ignored.
- the fundamentals of how to train a dog to do actions like a sit, recall and so on.
- that working on fear-based behaviours requires a fundamentally different approach
He's now a dog that I can live with
He's never going to be perfect, but I know what will set him off and can mostly avoid it.
After that rather rambly story, the point is that people CAN learn about dog ownership, training and behaviour, even if they've never owned one before, BUT you do have to put the effort in, keep learning, be consistent with the dog, and make a genuine commitment to the dog.