What the breed was built to do, which health problems to watch for and when, how they learn best — and an honest read on whether they fit your life.
Predispositions that tend to appear at certain ages, and a build that creates its own risks. Most owners find out at the vet, once it's already a problem.
One says two hours of exercise, another says thirty minutes. You end up guessing about an animal you're responsible for.
Herding breeds herd. Scent hounds follow scent and stop hearing you. Told it's disobedience, owners fight it. Told what it is, they redirect it.
The wrong breed for the hours, the space or the budget — and it was visible before the animal arrived, if anyone had asked.