Horse anatomy
Flank
The side area in front of the hind leg. Moves as the horse breathes and uses core muscles.
A closer look
The flank is the area on each side of the belly between the last rib and the hind leg, where you can watch the horse breathe. There are no bones under it and the skin is fairly thin, so you can see it rise and fall with each breath.
Why it matters
The flank is one of the easiest places to watch a horse's breathing and comfort. Fast, heavy movement while the horse is resting, or a horse that keeps looking at or kicking toward its belly, can be a sign of pain such as colic.
Care tip
To count breaths, watch one flank for 15 seconds, count each time it rises, and multiply by four. Learn your horse's normal number at rest so you can spot changes, and ask your vet what range to expect.
Common mistake
Many horses are ticklish in the flank, so brushing there roughly can lead to a kick or a swish. Use a soft brush, keep a hand on the horse, and stand close to its side.
Fun fact
Fast breathing can show exercise or stress.