It depends on the dog and the rest of the body language. Ears back is not necessarily fearful. Some Shepherds tend to put their ears back more when they're relaxed than others do. In some cases the ears back may mean the dog just may be unsure of you, or submissive, or worried.
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Jubal/Tesla (Beauceron) 3/14/14
Bianca HIC CGC TT (GSD) 4/24/04-10/23/12