In Greek mythology, Orthrus (Greek: Ὄρθρος , "Orthros") or Orthus (Greek: Ὄρθος , "Orthos") was, according to the mythographer Apollodorus, a two-headed dog who guarded Geryon's cattle and was killed by Heracles. He was the offspring of the monsters Echidna and Typhon, and the brother of Cerberus, who was also a multi-headed guard dog.
Heracles did not harm Orthrus in any way, shape, or form. 
( z1 harm :polarity - :ARG0 ( z2 heracles ) :ARG1 ( z3 orthrus ) :manner ( z4 or :op ( z5 way :mod ( z6 any ) ) :op ( z7 shape :mod z6 ) :op ( z8 form :mod z6 ) ) )