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I have a friend with a rescued Belgian Tervurin. It is aggressive and may bite you if you try to pet it. Also, you can't wear blue around this dog because it sets this particularly dog off. It's just fine with the owner but he has to get really used to you before you can trust it.
It sounds like the person that originally bought the Belgian did not know how to properly socilize it. Belgians require an obseen amount of socilizing before they are 6 months old or they have extremely bad habits ie. biting, growling, shying away.