I'm so sorry. I dont think any dog, especially a pup, would be very happy if you work past 5:30 PM a lot, does this mean the dog is alone from morning till night? It doesnt sound like you lead a lifestyle compatible with dog ownership. Perhaps a cat or two would be a better match. I hope you will seriously consider re-homing the little dog to someone who has more time for him, maybe a nice family with children.