Harry's patronus was always a stag.
Yes it is.
Her patronus is a swan.
It's Luna Lovegood, she has the hare patronus.
A Stag like Harry's.
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.
No, her patronus is an otter.
Yes, there is. Although, nobody in the Harry Potter series is known to have a dolphin patronus.
it was Snape's patronus
A Stag. This was his fathers patronus and animagus form while his mother's was a doe.
Harry Potter's patronus takes the shape of a stag, the animagus and patronus form of his father. The Patronus spell is used against Dementors but can also be used as a method of communication.
The incantation that produces a patronus.
dementors you silly Muggle!! ;)