You Could Look It Up

Q. Which is correct: hooves or hoofs? I can’t find a definitive answer.

A. The most common plural form of the noun hoof in American English is hooves. In British English, it’s hoofs. You can glean this information from the entries for hoof at Merriam-Webster.com (which records common American usage) and in the OED (which reflects British usage).

[This answer relies on the 17th edition of CMOS (2017) unless otherwise noted.]