I have great success using a high velocity blower on our long coat shepherd. She despises any form of brushing and you are hard pressed to get in more than a dozen swipes before she escapes. Loves and will stand freely for the blower (I believe the warming function greatly aids this compliance). Tip: cover ears before attempting.
Weekly/biweekly blowouts keep her coat manageable and greatly reduces compaction of hind fur. If she has any matting I cut several lengthwise slices into the spot prior to blowing. The matting then usually blows out or is reduced to level of finger management.
The dirt, hair and debris cloud produced is shocking. Definitely an outdoor task.