I agree that it is unclear, though me and a few other people I have discussed it with think it’s possible that Dean’s patronus is a Great Dane. It goes along with the dog idea, and it seems a little more likely than a beagle. That may be a matter of opinion, though.
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Dumbledore's patronus was a phoenix. He used his patronus in Goblet of Fire, chapter 28 to send a message.
Her patronus is a swan.
It's Luna Lovegood, she has the hare patronus.
A stag, the same animal his father turned into and likely the same patronus.
Draco Malfoy could never produce a patronus because he didn’t have any happy memories.