Basic info:

NON-REFLEXIVE: A verb is NOT reflexive when the person doing the action does it to / for someone else.

I put her shoes on (her feet). She brushes her dog's hair. They paint their little sister's nails.

REFLEXIVE: A verb is reflexive when the person doing the action receives / benefits from the action.

I put my shoes on (myself). She brushes her hair. They paint their nails.

A reflexive verb will require a reflexive pronoun to accompany it so the reader/listener knows who the action is being done to.