Wizards' Patronuses can sometimes change shape. Severus Snape loved Lily (Evans) Potter and so his patronus changed shape to the same one as Lily, a doe.
It is very likely that Snape's patronus didn't actually change shape and was always a doe since he had loved Lily all his life.
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Because when Snape met Lily he found a piece of her always with him and that was his nice side and she was best for him. So when she died Snape was so upset that his patrnous took of the shape of a doe.
Snape has the same patronus as Lily Potter because he has been in love with her for his entire life.
Snape was in love with Lily and so his patronus took the shape of hers.
In Harry Potter And The Deathy Hallows, Snape sends the silver doe patronus because he was in love with lily potter and that's what form hers was and how he rememebers her. Hope this helps!
Severus Snape was in love with Lily Evans, Harry Potter's mother. Snape's patronus is a deer because Lily's was a deer, and he was so in love with her that his patronus was the same as her's. It's a doe, actually.
Snape was very fond of Lily Potter and he loved her. They both have the same patronus, a doe.
In the world of Harry Potter, your patronus can change to the patronus of someone that you fall in love with. Snape was in love with Lily Potter, this is significant because it shows how much he loved her.