How can labrador surprise you? :-)

He lost his family and was very upset. But day by day he became more open and trustfull trusting. Soon, I realized he is a really smart dog who understands not only several words, but all intonations and common sense of the speech. And this small/little ("small" is okay, but little sounds more natural)  funny story allows you to believe in it.  (I would say, "This little story proves that he understands")
One day I supposed was going to be late at getting home from the office, so I called my son and asked him to go out with a the dog for the short time walking. I was going to walk longer when I got come back home. (To sound a little more natural I would say something like, "I was going to take him on a longer walk when I got home")

The dog was very happy to see me at get home in the late evening/later that evening. As I known knew he has  had been walking on a walk already I decided to eat something before go  I went out with him. I changed my dress, put on jeans, told him we go out a bit later, and went barefoot to the kitchen. I have been  was cooking making my sandwich, when I heard the dog came come and stayed behind me. I turned to him and was really surprised, he has had my sock in his mouth. I smiled and just for kidding jokingly him told: "If you are so smart to bring me this sock, go and bring me another one" Can you imaging? He rushed to my room and brought me another sock! ))) It was so funny and unbelievable. So I forgot about the sandwich, put on my socks, and went out with a the dog for a long long walking.