This Patronus is the same breed as Harry's pet owl Hedwig, who watched and protected him – perfect Patronus behaviour. Snowy owls are unique in that they are active during the day, making them the ideal wingman.
Written by the harrypotter.com team
“The Patronus is a kind of positive force, a projection of the very things that the Dementor feeds upon - hope, happiness, the desire to survive – but it cannot feel despair, as real humans can, so the Dementors can’t hurt it.”