Parental Guilt

I am having extreme guilt about having to leave my dog all day while I work. It doesn't help that I work 2 jobs - Veterans Affairs by day and bartender at Dalvay By the Sea 4 nights a week. So some days, we go for a walk in the morning, I see him again at lunch time, again for a few minutes between jobs and not again until midnight. I am suffering from such guilt! And Desoto can turn on the sad looks like you would not believe. At least , since I am staying with my parents while house-hunting, they are home with him more than I am, but still since they also work, he is alone a lot. I feel bad that I am not home playing with him during the day, that he either has to be tied up in the yard or shut in the house or garage while I am not home. This seems cruel and adds to the already overwhelming guilt. I am a terrible mother for leaving him all day. Obviously, I can never have children - I wouldn't be able to leave my house!