I know it was her Patronus. But.

As JKR stated in an interview:

Chely: James patronus is a stag and lilys a doe is that a coincidence?

J.K. Rowling: No, the Patronus often mutates to take the image of the love of one's life (because they so often become the 'happy thought' that generates a Patronus).

Meaning Lily's Patronus does not represent her personality as Snape knew it. Apparently Lily's Patronus would be (or was - if she mastered it earlier) something different, more personal. Obviously Snape's Patronus should have changed together with Lily's from being something different before (if he could cast it by the time).

Doe is the evidence of Lily's love for Snape's worst enemy - probably the worst thing happened in Snape's life apart from her death. How does this represent the happiest thoughts for Snape? Basically, Snape's Patronus mutates to match James's - which is just bizarre, especially when you think that Snape should be aware of it.

Side thoughts: Patronus probably should not necessarily take form of your love's Patronus to match. We see Tonks cast a wolf when fall in love with Lupin - probably just because a wolf is something that associated with him in her mind. I doubt that Lupin's Patronus is a wolf, given he should consider it to be the most hated part of himself. So Patronus should be more about your own perception of the loved one (speculative though). So... why a doe?!

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    Can't see how this is a dupe :( The answer "because Snape loved Lily" does not fit at all. Seems I'm pretty bad in explaining my thoughts here. – Shana Tar Oct 29 '18 at 17:49
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    This is a legitimate question that raises a valid point, and the supposed duplicate doesn't answer the point of this question. The theory that Snape's patronus matches James' patronus (through Lily) doesn't make sense. – QuestionAuthority Oct 29 '18 at 17:55
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    1.Are we sure that it was Lily's patronus that changed to match James one, not other way around? 2. Snape loved her unconditionally - it wouldn't matter to him that her patronus changed to match her husband one. – Yasskier Oct 29 '18 at 19:49
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    @Yasskier Given James' animagus form, it is very likely that the stag was his original patronus – Quasi_Stomach Oct 29 '18 at 20:28
  • @Yasskier 1. Yes, I think we can safely assume it was Lily's Patronus that changed as JKR herself said that usually Patronus and Animagus form are the same for a person. 2. That gives Snape a new depth to his personality I think - being able to accept her love for James. Nice touch. – Shana Tar Oct 30 '18 at 6:59

As it was already answered here Snape had the same patronus as Lily, because he was in love with her. For all those years - his love was pure and unconditional:

"But this is touching, Severus" said Dumbledore seriously. "Have you grown to care for the boy, after all?"

"For him?" shouted Snape. "Expecto Patronum!"

From the tip of his wand burst the silver doe: She landed on the office floor, bounded across the office, and soared out of the window. Dumbledore watched her fly away, and as he silvery glow faded he turned back to Snape, and his eyes were full of tears.

"After all this time?"

"Always" said Snape.

For Snape it doesn't matter that Lily's patronus has changed to match James one - it is still Lily's patronus, something that is expression of her hope and happiness; it still comes from the person that he loves. So while it most probably hurt Snape, that Lily's patronus has changed (same as it hurt him, that she has chosen James - someone he hated), in the end it didn't matter to him as long as Lily was happy.

Even more, please notice that Snape's patronus is EXACTLY the same as Lily's one. In contrast, note that while similar - Lily's and James's one differ not only in gender, but in specie - doe is not "female stag": "stag" is a male red deer, female is "hind", male version of "doe" (a roe deer) is "buck". This shows how deeply in love he is.

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    I would not agree that Lily's happiness meant much for Snape. When he asked Dumbledore to protect her it is strongly implied he didn't care that she could lost her husband and her son and suffer the loss. The idea of protecting Harry for her was put in his mind by Dumbledore later. – Shana Tar Oct 31 '18 at 6:11
  • Nice point about about Snape's Patronus being exactly the same... Yes I think it would indicate his unconditional love, the love that would stay the same however she would change as a person (unlike Lily's love for James, who needed to proof he was worthy first) – Shana Tar Oct 31 '18 at 6:18

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