This reminds me of someone who thinks he knows how to shoot a gun.
He's the one that buys the 44 magnums etcc. He doesn't just have one, but 2 or 3 of them. He will tell you how to do this & that with them. When you finally go to the range, he's more of a danger to himself & the people around him. Then when you finally look at his target, it looks like he only hit his target half of the time.
Trust me, no matter how much you "know it all", there's always something to learn. Just like there's no two people alike, the same applies to dogs.