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In the two examples shown of an Animagus capable of casting a corporeal Patronus (Minerva McGonagall and James Potter) both had the same animal as their Patronus and as their Animagus animal.

Now, it is also shown that extreme circumstances can change one's Patronus. I think the only example of this was Tonks, which turned from a jackrabbit into a wolf in response for her love of Lupin.

If Tonks (or any other wizard who had their Patronus change) had been an animagus, would her animagus have changed as well?

  • I think not, you choose your animagus animal, you don't choose your patronus. – ZenLogic Aug 16 '14 at 21:51
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    You don't choose your Animagus animal. It's dependent on inner traits - the specific wording is that it is that you "become the animal that suits you best". – Kevin Aug 16 '14 at 22:00
  • Oh, my mistake, I thought it was a choice made at the time of first transformation – ZenLogic Aug 16 '14 at 22:02
  • @Kevin where is that quote from? It is likely the answer. – anotherguest Aug 18 '14 at 12:58
  • Alex has the full quote (and source) in his answer. It is relatively unenlightening. – Kevin Aug 19 '14 at 4:16
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Unclear, but I would guess not.

There are so few Animagi in canon, or examples of Patronuses changing, that we don’t have an explicit example to call upon. I’m going to speculate based on what we know about Animagi an Patronuses.

Your Animagus form isn’t determined by choice, but instead reflects your personality:

When you turn into an Animagus, can you choose what animal you become? Or does this get "assigned" to you?

No, you can't choose. You become the animal that suits you best. Imagine the humiliation when you finally transform after years of study and find that you most closely resemble a warthog.

J.K. Rowling’s World Book Day Chat (July 2004)

So your Animagus form is determined by characteristics that are “internal”.

The one example we have of a Patronus changing form is Tonks, which is driven by her love for Lupin, which might be described as an “external” characteristic. I would guess that the happy memory she uses to conjure a Patronus is something to do with Lupin, which would contribute directly to the change.

He was, however, reminded of a question he had with regard to Tonks, and who better to ask than Lupin, the man who knew all about Patronuses?

“Tonks’s Patronus has changed its form,” he told him. “Snape said so, anyway. I didn’t know that could happen. Why would your Patronus change?”

Lupin took his time chewing his turkey and swallowing before saying slowly, ”Sometimes… a great shock… an emotional upheaval…”

Half-Blood Prince, chapter 16 (A Very Frosty Christmas)

Personality tends not to change, but the happy events and memories we have are changing (and hopefully growing) as our life continues. A happy memory, which might motivate a change in Patronus, probably doesn’t affect your inner personality. Hence, I’d be inclined to think it wouldn’t lead to a change in Animagus form.

  • 4
    But someone's internal characteristics could change during the course of a lifetime. Who's to say that someone who was best suited by a hummingbird when they were 17 would still be hummingbirdlike at 77. In fact, most people wouldn't be same at two different ages, if they've had any growth at all. – Shisa Aug 17 '14 at 3:10
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    I think that what makes the change in Tonks' Patronus so poignant is precisely the implication that her love for Lupin was strong enough to affect her in a very profound way - i.e. change her. – Misha R Jun 21 '15 at 2:25
  • I thought it was rather the opposite with Tonk's Patronus - the worry she was feeling over Lupin going undercover with Greyback manifested in her Patronus, changing its form. – DavidS Nov 13 '15 at 9:59
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No, but uncertain

The animal into which one turns, if an Animagus, seems always to be that which becomes the Patronus. There is no known instance of the Animagus form changing to match the Patronus if the latter changes, but the Animagus who can also produce a Patronus is highly unusual and no study has ever been done on sufficient numbers to draw firm conclusions.
Pottermore - Animagi (behind paywall)

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    This is the best answer over here! (+1) I didn't know there are paywalls even in Pottermore! – Harry Weasley Dec 4 '17 at 5:58
  • @HarryWeasley - The use of the term "paywall" can be debated, but it's content which can only be (legally) accessed by buying a Pottermore ebook. – ibid Dec 4 '17 at 6:00
  • Thanks, it's definitely a conclusive answer (though it ironically doesn't come to a conclusion) as it's canon! – Harry Weasley Dec 4 '17 at 6:01
  • What's the ebook you read this in? – Harry Weasley Dec 4 '17 at 6:02
  • @HarryWeasley - Short Stories from Hogwarts of Heroism, Hardship and Dangerous Hobbies (I've linked to it's Pottermore shop page in the answer). Before you splurge any money bear in mind that the only actual new content is the Animagi article and some minor updates (previously removed for spoilers) to two other articles. Only 1,821 words of new content. – ibid Dec 4 '17 at 6:06
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I would venture it is the other way around. If a witch or wizard had previously cast a patronus BEFORE becoming an animagus, after the animagus spell took hold, becoming an animal would be a stronger, more triumphant memory and the person's patronus would change to match, if it wasn't already matching. Then the question becomes, if an animagus with a matching Patronus is traumatized, could the patronus change to NOT match the animagus form? I would imagine for storytelling purposes, the only way an animagus would lose a matching patronus is if something traumatic happened while they were IN ANIMAGUS FORM. Consequently, they would no longer want to transform into that animal anymore (or be unable to) and their patronus would change too.

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