5. Irish Terrier.
This dog breed originated, you probably guessed, from Ireland and is quite unique when it comes to its in-home nature. The Irish terrier, widely known for being aggressive in nature, is a great dog breed for the older adult looking for one dog to occupy the home. They are truly a very loyal breed and they tend to be quite independent. If you enjoy being active, the Irish terrier will make a great fit, because this dog breed is known for being active. The Irish terrier can reach about 25 pounds in size and they will typically live to about 14 years in age.