Danny is Jonathan's pet dog, bought by his father while still a puppy when Jonathan was five years old. Jonathan and Danny didn't get along for a while, which caused Danny to bite Jonathan. Jonathan, in turn, attacked Danny by throwing stones at him. One day, while swimming in a river, Jonathan started drowning and was saved by Danny, which made them the best of friends. When Dio arrived, he kneed Danny in the jaw and later put him into a box, planning to incinerate the dog. Danny was burned to death and buried in the backyard of the Joestar Estate.