Let's talk about Dogs!!

OK so first of all I am not an animal lover, I think they are cute and I love to pet them when they belong to someone else, well my husband and my children have wanted a dog for years so I told them that when we got a fence and when the baby was walking we could get a dog, so last January we got a dog, and can I just say that he is the bane of my existence, he was really easy to potty train, however about twice a week he decides to mark his territory all over my bed and my sons bed. So to all of my animal loving friends how do I learn to love and accept this dog?