I dont think that a beagle puppy is getting adequate chance to burn off the excess energy during the day if it is played with once at lunchtime and the owner doesnt return home until "hours past" 5:30 PM. It sounds to me like a lifestyle issue that is turning into a behaviour one. I would be just as despondant as that pup if I lived that life, imagine being a social pack animal forced to spend the majority of your time alone. Perhaps hiring a pet sitter to come a couple times a day to walk the dog might help. I really feel for the pup and hope the owner finds a resolution soon.