Old man (looking at Isaac): Is that the same kind of dog they had over at the hospital?
Me (because how would I know what kind of dog someone had at some hospital at some time): I don't know.
Old man: I think that was the same kind of dog. I think that one passed away, though.
Me (wondering why people always want to tell me about dead dogs): I'm sorry to hear that.
Old man: What kind of dog is that, anyway?
Me: He's a lab.
Old man: No, I know that. I mean what's he for?
Me: He's a service dog.
Old man: A service dog?
Old man: So he helps you get around and stuff?