Does your dog act sad before you leave to go somewhere?

It depends. When I have to leave in the morning for classes, he just looks at me with an interested face, but he doesn't even the sofa where he's usually laying down, he just puts he's head up. In the afternoon, which is the time I usually take him for his walk, he gets very agitated and when I leave the house without him he goes to the window to look outside at me, hoping I come back and get him.