HI, I've got two dogs and wouldn't be without them. We got our last one two years ago as a pup and house trained it before I started work again. Once I was back at work, I would walk both dogs first thing in the morning and then shut the up stairs of the house off to them, leaving them the rest of the house and the garden (make sure that your garden is secured, i.e decent sized fence, over six foot tall if having anything bigger than jack russell sort) and then I and my husband would take them out in the evening when we got back, and of course threee or four times a day at the weekends. It is not the ideal solution but a dog enhances your life and your families, children growing up with dogs have better social skills and the family is more balanced. If you do get one then make sure that you don't just suddenly leave it on it's own, this will terrify him/her and that's when the trouble starts. Here are plenty of books out there to help you with this, but if you could take the dog to work with you, it would be better,
Good luck