In the Twilight series Jacob Black has long hair to begin with and then he changed it when he transformed into a wolf. Why did he do that?
Why does jacob black change his hair style?
Bella asks the same question to Jacob when she sees him with his hair cut off and also asks about his new tattoo. The reason was not mentioned in the movie. When she asks about his hair, instead of asnwering, he quickly changes the topic to Cullens.
In Twilight Wiki, it's mentioned that,
Twilight and New Moon start off with him having long hair, however, Jacob decides to cut it off because long hair as a human means long hair as a wolf, although, he decides to grow it back, because he thinks that Bella likes him more with long hair.