Which house he represented? Gryffindor? Ravenclaw? Slytherin? Hufflepuff?
Gryffindor
Which animal he is allergic to?
Cats
Why he couldn't spell "Patronus"?
Because it was a hard magic spell
Which weapon he can use very well?
Crossbow
Why did Hagrid give Dudley a tail?
Because he was eating Harry's cake without asking
Why Hagrid came to Dursleys?
Because they didn't let him go to Hogwarts.
