I understand that one of the most difficult moments of a dog's life is when his owner is away. So, I am willing to become a good company for him at least for a couple of minutes to make him feel a little happier. For that, I am planning to play with him, to feed him, to walk with him, so he can can have a better day and he is going to be be ready for his owner (you) when you come back. Regarding my experience, I have gotten some experience as a sitter with my friends' dogs. Whenever they had to travel or to spend long hours away from their home, I was asked to take care of their dogs during this time. I live with two other people. Even though they work during the whole day, it is possible to happen for them to meet the dog. However, I do not see any problem with this situation since they are fond of pets too.