3 words for HIKOSY 5-letter words

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5 letters (3)

On the back of an animal
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D
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O
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R
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Hint 1 meaning
Pertaining to, or situated near, the back, or dorsum, of an animal or of one of its parts; notal; tergal; neural; as, the dorsal fin of a fish; the dorsal artery of the tongue; -- opposed to ventral.
Hint 2 anagram
DRLAOS
Hint 3 another clue
BACK ___!
3 +1