How does the next paragraph end?

How to know if your old dog stops recognizing people
Pay attention to whether your dog follows people.
Dogs are generally capable of recognizing the faces of their owners and others they love. If your dog recognizes someone, it's likely to follow that person around, especially when greeting a person.
If someone, say, enters a room that a dog knows, they'll generally follow them initially. If a friend walks in that your dog knows, it's normal for your dog to follow them for a few minutes.