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My question is simple. We know that a patronus can take the form of a magical animal (Dumbledore's phoenix patronus for example). So, can it take the form of a dementor? It would be a little bit ironic.

Perhaps there isn't any canon answer, but I'd like to know.

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Analogous question for Lethifolds too (see HarryPotterWiki). And more astute because Lethifolds classify as beasts according to Fantastic Beasts while Dementors are non-beings. – N Unnikrishnan Jul 10 '14 at 12:03
"My Patronus is a dementor" - Grumpy Cat. – pleurocoelus Apr 10 at 12:49
I felt that my answer to this one was pretty convincing. Is there anything else you'd like me to add before considering an acceptance? – Valorum Jul 2 at 9:36

In a word, no. The patronus must take the form of something that creates positive feelings (a dementor is by definition the embodiment of unhappy feelings, primarily fear) and the shape of an animal with whom they share an affinity. Not only would someone who had an affinity for a dementor be unable to create a patronus, it's also fairly questionable whether a dementor qualifies as a 'animal':

"This ancient and mysterious charm conjures a magical guardian, a projection of all your most positive feelings. The Patronus Charm is difficult, and many witches and wizards are unable to produce a full, corporeal Patronus, a guardian which generally takes the shape of the animal with whom they share the deepest affinity" - Wonderbook : Book of Spells


"A Patronus is a kind of positive force, and for the wizard who can conjure one, it works something like a shield, with the Dementor feeding on it, rather than him. In order for it to work, you need to think of a memory. Not just any memory, a very happy memory, a very powerful memory… Allow it to fill you up... lose yourself in it... then speak the incantation " Expecto Patronum " HP:PoA (Film)

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Likewise if someone had an affinity with dementors he/she would not be casting a patronus anyway. – CandiedMango Jul 9 '14 at 13:21
"someone who had an affinity for a dementor would be unable to cart a patronus" Dolores Umbridge is able to. I don't know that she'd necessarily have an affinity with a Dementor, but she's generally a pretty unpleasant person. – phantom42 Jul 9 '14 at 13:22
@phantom42 - Apparently her ability to cast a corporeal patronus is because she's a) delusional and b) not a true death eater (and c) because JKR mucked up and had to retcon a reason why a baddie could cast a patronus). – Valorum Jul 9 '14 at 13:25
@phantom42 They said would not be casting one... not that they are unable to do so... Most dark wizards usually do not attempt to cast spells that are not of the dark arts.. And there have been cases where Dark Wizards attempting to use Patronus had it backfire... As Richard said Dolores wasn't necessarily a "Dark" Wizard / true Death Eater she was just simply crazy. – DoctorWho22 Jul 9 '14 at 14:00
Source? The quote I found says "a Patronus is used against things that the Death Eaters generally generate, or fight alongside. They would not need Patronuses." – phantom42 Jul 9 '14 at 14:39

This would be a bit ironic. It would be hard, but I personally don't see a reason why it wouldn't be possible. As @Richard said, a dementor is the embodiment of unhappiness, but there are some people who feel happy when they are depressed. There are stranger ways people can feel/behave.

Another issue with a Patronus being a dementor is why the person creating this Patronus would need to create one, if he/she had an affinity with dementors. In this case, I would imagine he/she wouldn't have many happy memories to draw on, though, again, there are stranger things in this world than a person being happy and depressed at the same time. Also, there are other creatures that get repelled by Patronuses, so even if the person didn't need to create one to battle dementors, he/she may need one for these creatures. Also, there is the matter of creating one for fun/training, as Dumbledore's Army did in Order of the Phoenix.

Regarding a dementor being an animal, I'm not sure, but as they are (slightly) intelligent, I don't think they are "merely" animals, in the same way humans aren't "merely" animals. That being said, I don't believe J.K. Rowling ever said a Patronus has to be an animal. I don't see why, for example, a Patronus couldn't be a human, or a giant, etc. For narcissists, like Gilderoy Lockhart, I imagine they could have a Patronus in the form of themselves.

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Unless their happiest memory was watching a dementor destroy their abusers. A sad life, but certainly possible... – Izkata Jul 9 '14 at 16:36
The very idea of Gilderoy Lockhart's patronus being Gilderoy Lockhart is making my day. Thanks for this answer! – tkolar Apr 27 '15 at 7:32

Dementors aren't animals so the answer is probably no.

To clarify they are amortal non-beings. They are not animals or humanoids but spirts that are manifestations of despair.

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Note that while a person with an evil heart cannot cast a patronus according to legend without getting eaten by maggots, an affinity for a dementor does not mean they are nessesarily evil. I could imagine an unlikely emo slytherin kid who idolizes voldemort and dementors for their power (but not actually want to kill) having an affinity for dementors (though he still wouldn't enjoy hanging out with them). He only has to be as pure of heart as Umbridge after all. – anotherguest Jul 9 '14 at 13:33
In which case they would fail the "competent but unworthy" test. – Valorum Jul 9 '14 at 15:16
@Richard "competent but unworthy" test? I know death metal fans who a teddy bears at heart. That is what I am talking about. Dementors belong on an 80's album cover. – anotherguest Jul 9 '14 at 19:52

In the book Patronus Charms are only Animals, And since Dementors are non-animals because of their sentience they would not be a shape found in a patronus.

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Why not, I think it could be possible. Maybe the person in question is friends with some Dementors or has some other reason for Dementors being part of their happiest memory. Maybe, as some other people have said, the Dementors saved them from something.

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