Not a service dog

I was working on next month's work schedule in my office when one of the staff members on the desk came to get me and said "I'm sorry to bother you, but a woman has tied her dog up inside the library and I don't know what to do."

Sure enough, I went out to the public floor and saw that there was a large golden retriever tied to a newspaper rack in the little vestibule between our lobby and the actual outside. I looked around and didn't see anyone who was obviously the dog's owner, so I went over to the dog, hoping that whoever was with the dog would notice and come and talk to me. As I was approaching the vestibule, another patron came up to the library doors from the outside, looked nervously at this 75-pound dog, and hesitated. As I was trying to figure out if I could maybe stand between the nervous patron and this dog so that the patron could come in, a woman about my age bustled up to me from inside the library and huffed irritably, as though she was incredibly put-upon: "Don't worry about it! I am taking him outside right now!" She unclipped his leash while giving a massive eye roll and stormed out with her golden retriever, turning to whine over her shoulder, "I was just going to print something really quick!"