Like the coats of most sheepdogs (6)

I believe the answer is:

shaggy

(Other definitions for shaggy that I've seen before include "Hairy and unkempt" , "Covered with long hair or wool" , "Long and unmanageable (of hair) - Scooby Doo's pal" , "Hairily unkempt" , "Unshorn - Scooby Doo's pal" .)

I've seen this clue in the LA Times.

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