What Is a Dog?

"We are going to do a project about entrepreneurship! We watched 'Shark Tank' before, and we are going to do a project just like 'Shark Tank'." Mrs. Penny was talking to her class. They were going to choose two services from the sheet, and present in front of the class. Mrs. Penny separated them into three groups. Two of them had competition between them, and the other one was the "Shark". The services were dog care, and someone who was in my group asked, "Dog? What do you mean is dog? For instance, hot dog? I really like hot dogs."