What is the name of the amount of fur some wolves have around their neck?

Like if it was a scarf... The funniest is that most of wolves dont have it, its rare to find any wolf with this "scarf" this bigger amount of fur.

Its like, on their neck they have a bigger amount of fur than in the rest of his body that gives this sensation of "scarf"... And I was looking the other day for wolves with this aspect.. And I just cant find. So I am trying to know the name of it.