An (archaic) word for “horse” in the Gnomish Lexicon of the 1910s given as {mairog >>} mair, cognate to ᴱQ. mairo (GL/56), which appeared as ᴱQ. mairu in the Qenya Lexicon of the 1910s under the early root ᴱ√MAẎA (QL/60).
Gnomish
lob-
verb. to run, gallop (of animals)
mair
noun. horse
brog
noun. horse
The Gnomish Lexicon of the 1910s had a verb G. lob “run, gallop (of animals)” with a past form lompi (GL/54), clearly the equivalent of ᴱQ. lopo- of the same meaning in the contemporaneous Qenya Lexicon under the early root ᴱ√LOPO (QL/56).
Neo-Sindarin: Derivatives of √LOP continued to appear in Tolkien’s later writings, such as N. lobor “horse” and Q. lopoldë “rabbit”. I would therefore retain ᴺS. lob- to describe the four-legged run of these and similar animals, meaning “gallop” or “lope”.