What Does That Mean?

Today at the office supply store, an older man started talking to Isaac. Then he read the patch on Isaac's vest that says "Please do not pet me, I'm working."

He said, "Do not pet me... what does that mean?"

I'm like, "It means don't pet him. He's working and it distracts him."

The guy says, "Oh, is that what it means?"

I say "yes."

And then he starts telling me how he used to have three dogs but they died.