Houyhnhnm
asinine
bovid
bovine
brood mare
caballine
caprid
caprine
charger
colt
courser
cowish
cowlike
critter
deerlike
dobbin
entire
entire horse
equestrian
filly
foal
gelding
goatish
goatlike
hippic
hircine
hoggish
hoofed
horse
horsey
horsy
mare
mount
mulish
nag
or
ovine
piggish
prancer
ruminant
sheepish
sheeplike
solidungulate
soliped
stallion
steed
stud
studhorse
odd-toed ungulate
perissodactyl
perissodactyl mammal
ass
equus caballus
equus quagga
hinny
mule
quagga
zebra
aquatic
avian
canine
equestrienne
equitation
feline
half-suppressed
herbivorous
horses'
meaty
nonhuman
reptilian
scaly
superhuman
unladylike
well-muscled