Given that in Harry Potter and the Half-Blood Prince, Tonks' Patronus was revealed to have changed into a wolf when she fell in love with Remus Lupin, it's a reasonably safe assumption that ...

In Harry Potter, the Patronus is a powerful spell ... once she fell in love with Lupin, it changed to a wolf, representing Lupin's werewolf nature. Being an Auror and a member of the Order ...