oats - the most common cereal grain fed to equines
obedient horse - a manageable horse that willingly complies
occult - hidden
ocular - pertaining to the eyes
off side - the right side of a horse
official blueprint - the breed standard
offspring - product of an equine sire and dam
OLWS - initialism for overo lethal white syndrome
omission - to omit
on the market - put up for sale
online auction house - an online wholesaling agent that brings horse purchasers and sellers together
olfactory - related to sense of smell
on the bandwagon - slang for an individual who is unable to make up their own mind
one-trick pony - slang for an individual with training or expertise in one particular area only
open - not pregnant
open show - horse show open to the general public and horses of any age or sex
open stud book - a registry who accepts horses whose sire and dam are not registered in it
open wound - injury in which the skin is cut
opinion - a legal decision
opisthotonus - an arching position of the head caused by brain disease or poisoning
opioid - narcotic drug
opportunistic - disease that is only infectious to horses with reduced resistance
opportunists - individuals who ignore ethics and use circumstances to meet particular goals
opportunity -a favorable and timely circumstance
orally - by mouth
ordinances - laws enacted by local government
.org - the end of a public organization web address
organ - different tissues working together for a common task
organ affected - the primary body part affected by disease
organism - any living thing
Orwellian - term used by some to describe an overpowering government
osteopetrosis - increased bone brittleness
osteoporosis - weakening of the bone
osteomyelitis - bone marrow inflammation
out of - referring to the dam
outbreak - the sudden expension of a disease
outbreeding - mating unrelated horses
outside mare - a mare visiting a farm for breeding purposes that is not owned by the breeding farm
over at the knee - when a horse naturally stands with its front legs bent somewhat forward at the knee
overo - a general term used to describe any pinto spotting pattern other than tobiano
overo lethal white syndrome - lethal recessive genetic disorder causing intestinal abnormalities & death
overshot - when the upper teeth extend beyond the lower teeth
ovulate - when a mature egg is released
ownership - to be owned by or belong to
oxymoron - contradictory phrase such as 'synthetic natural gas' or 'computer security'
oxytocic - labor inducing
oxytocin - drug used to help a mare expel the placenta and/or let down milk
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