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Half-Life: Opposing Force Hints
Houndeyes
Houndeyes are the dog-like creatures from Half-Life. They travel in small packs and produce a shrill sonic burst that can injure their victims. Houndeyes are very easy to deal with. A shot to the head will kill them immediately. Make sure to take out the houndeyes that are starting to "scream" before they unleash their attack on you.