Are German Shepherds aggressive?

I've wanted one my entire life but my dad thinks they turn aggressive after a while, even if you took good care of them from when they were pups. He said he knows people who had a German Shepherd and suddenly they'd turn aggressive for no reason and bite their owners. If you had one, is it true? And would... show more I've wanted one my entire life but my dad thinks they turn aggressive after a while, even if you took good care of them from when they were pups. He said he knows people who had a German Shepherd and suddenly they'd turn aggressive for no reason and bite their owners. If you had one, is it true? And would you recommend me getting one? Thanks.
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