What is the implied main idea of this paraghraph ?
"For an older person who lives alone, having a dog in the house or apartment provides companionship. Physical contact with a dog can also be helpful. Patting a dog has been shown to lower the blood pressure of both the human and the dog. A dog owner frequently talks to the pet, and talking helps keep the owner’s mind active. In addition, the dog depends on the person for its survival. Being needed by another living creature creates a sense of purpose in a senior citizen’s life. The dog must be fed and walked at regular intervals. This helps the person maintain a daily routine and stay physically active in older age. Dog walking also encourages the owner to have contact with other human beings. "