Adopting a dog can be a life-changing experience. Bringing a new, loving animal into your household can better the lives of you, your family members, and the dog. When you go to a shelter to choose a dog to adopt, don't overlook senior dogs. A senior dog is generally put into this category when he or she reaches 7 years of age. Aging depends on the size and breed of your dog, for example small dogs mature slower and become seniors later in life than larger dogs. Animal shelters are filled with healthy, active senior dogs who need loving homes. They are in need of attention and care just as much as puppies, if not more. When you are thinking of adopting, keep these 6 reasons to adopt a senior dog in mind.