The Transformation

'There was a terrible snarling noise. Lupin's head was lengthening. So was his body. His shoulders were hunching. Hair was sprouting visibly on his face and hands, which were curling into clawed paws.' (Harry Potter and the Prisoner of Azkaban, p. 279, UK edition). Slightly inspired by the same scene in the recent film.

Just to clarify, this is not Remus as a fully transformed werewolf. He's in the middle of the transformation. I picture him becoming much more dog like when he has finished his transformation.