hire a walker. 25 bucks per week. for one hour per day. most walkers love dogs and will probably keep hiim longer.
i walk a couple of dogs during the day whose owners cannot be there for them. you will have to deal with your own separation anxiety when your dog begins to show more love for the person walking them than they do to you. you will end up being only the 'feeder' whereas the walker will be the one who provided emotional support for them. Emotional support fun and companionship. beats money/food every time. if you love your dog, you will allow your dog to love someone else who can give to him what he needs.