Question

goats, sheep, and swine are all quadrus, meaning they walk on four legs.
dauntless
fraught
gingerly
interminable
monotonous
ped- (greek root)
ped- (latin root)
surmount
unpalatable
wanton
pod- (greek root)

Explanation:

The word "quadruped" is formed from the Latin root "ped" (meaning foot) and "quadru" (meaning four). Since the sentence mentions animals that walk on four legs, "quadruped" fits the context.

Answer:

quadrupeds