I grew up having dogs as pets, and feeding them always seemed to be pretty simple: put food in the bowl, and when it was gone, put more food in the bowl. This usually wound up being roughly every day, although not always. My memory as a child was pretty much this: just make sure they always have food in their bowl and they'll be fine. I remember that my dogs always seemed lean and healthy and energetic.
Edit: for context, this was out on a 100+ acre farm where both I and the dogs spent a lot of time playing outside and exploring and running around. My childhood dogs spent very little time in their pens.
Now as an adult, I'm trying to make sure I do the right thing for a dog, and I'm wondering if that's the right approach.
Will a dog tend to eat the right amount on its own, or do I have to regulate the amount of food more carefully than that to make sure it doesn't overeat?