I would like to say that I really understand people, but I don't. Dogs are much easier and this one is very easy to "get". Love is written on his face- just look at that nose! With humans, its quite difficult to know their hearts, even ones you think you know.
Paul's second letter to the Corinthians shows he knows them well, and their heart.
2 Corinthians, Chapter 3 (World English Bible)
1 Are we beginning again to commend ourselves? Or do we need, as do some, letters of commendation to you or from you? 2 You are our letter, written in our hearts, known and read by all men, 3 being revealed that you are a letter of Christ, served by us, written not with ink, but with the Spirit of the living God; not in tablets of stone, but in tablets that are hearts of flesh.
There is a difference between a person who does things because he has to or because he wants to. Love is that difference; the love of Christ! Better than rules that are just obeyed, love changes you inside. Somehow, I wish people could be understood by their noses- just like that dog. Not likely, but I can hope!