Equinoids were a race of humanoid horses.
Equinoids resembled purple horses with yellow spots. Unlike horses, they stood on their hind legs and had humanoid hands with four fingers and a thumb. (Perceptions)
In the 19th century, two Equinoids, husband and wife P’fer’d and M’rek’d, crash-landed on Earth after running out of fuel. After setting off a distress beacon, they disguise their ship as a solicitor’s office, Binns, Beech & Evans Solicitors, using a Mark III Image Inducer, so as to stay inconspicuous in Victorian eraLondon. The Eighth Doctor used spare energy cells from his TARDIS to send them home again. (Perceptions)
At some point, an Equinoid attended the Third Intergalactic Peace Conference. (Frontier in Space)