Some cats have extra toes. Called polydactyl, cats with extra toes also have extra nails, so make sure you find and trim them all. Like human nails, a cat's nail is made of keratin, a hard protein.

Kicking off the series, in honor of Black History Month, Aguirre, Sha’Carri Richardson’s nail artist, recalls the Black history behind extra extra-long nails—while breaking down techniques ...