It could be too young to bloom yet, mature plants of this species usually get to around 2' long. But, like orkie said, it may bloom later; this section of Dendrobium has a pretty wide range of bloom times depending on when they receive environmental cues.
If you haven't already done so, giving it a month or more of cool nights (60-ish F or below) should cue it to initiate buds if it has the energy to do so. Just make sure it's getting bright light and regular water. Try to water in the morning so the roots can dry by evening when nights are cool. Good luck!
--Nat
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