my husband and i are desperate to get a dog after he lost his family pet earlier this year, and i lost mine last year. we both both work 9-5 monday to friday and have busy social lives and made the horrible (but inevitable) decision that we just cannot do it.
i know you're excited, and you feel its too late to go back, but perhaps you'd be better with a cat - they don't rely on human contact in the way that a dog does, and they come and go as they please.
please please re think, it might be heart breaking to know you can never have one, but do you really want the poor thing pining for you all day, 6 days a week?