brave
courageous
spirited
active
acute
aggressive
agitable
animated
beany
brisk
bulldoggish
dauntless
dynamic
edgy
emotional
emotionally unstable
energetic
enterprising
enthusiastic
eruptive
excitable
explosive
fiery
forceful
forcible
full of pep
game
gamy
go-go
gritty
gutsy
gutty
hearty
high-mettled
high-spirited
high-strung
highly emotional
impetuous
incisive
inflammable
intense
irascible
irritable
keen
kinetic
lively
living
lusty
nervous
barebacked
country-bred
eight-legged
excursive
fleetest
foam-flecked
freehearted
half-broken
high-blooded
one-year-old
piebald
restive
riderless
rough-tongued
rumbustious
sapphine
short-tailed
spavined
swift-footed
unbeaten
unshod
untamed