Boyd’s Bible Dictionary:
(shammy) (buck). The chamois not known in Palestine. A wild sheep, or goat, may be meant (Deut. 14:5).
Concise Bible Dictionary:
The Hebrew word is zemer (Deut. 14:5), which is held to signify “leaper,” and would thus suit the chamois; but this animal is unknown in Palestine and is supposed never to have existed there. It has been suggested that the animal specified is the aoudad, the mountain sheep; others judge the wild goat to be referred to.
Strong’s Dictionary of Hebrew Words:
Meaning:
apparently from 2167 or 2168; a gazelle (from its lightly touching the ground)