Dogs love running, playing and basically all kinds of physical exercise, just like human beings do. Not getting enough of it not only leads to boredom and frustration, but can also result in a number of health problems and physical issues like weight gain and heart problems.
Setting out an hour a day to walk your dog to the park and playing with him in your backyard is a great idea and should be done on a regular basis. This will be enough to show your dog that you care, while allowing him to expend pent up energy after sitting at home while you were at work. Exercise is the best way to keep a dog from boredom,
Dogs love human companionship; this is why they are termed "man's most faithful friend" because in most situations, a dog will lay down his life for the owner without even thinking twice. This is a major reason why you should treat your dog like he is a member of the family; keep him with you most of the time, and trying to involve him in every family activity.
Going on vacations, going to the beach or having picnics in the park, are all activities in which you should include your dog, to keep him/her from getting bored. Your dog will love accompanying you and you never know, it might be a lot more fun than you thought possible.
Like children, dogs love toys that are especially made for them; what they love even more is being able to bite and wrestle around with toys for hours on end. When you are gone to work and no one is home to play with the dog, make sure he/she has enough toys to stay busy and entertained until you get back home.
It is important to get your dog regularly checked up by the veterinarian so that there are no health issues like depression or stress of any sort. Although your dog may not like visits to the vet very much, they are bound to keep it from being bored, in addition to ensuring its health and well-being.