Ferrets rub their face to clean the food off. I always leave a towel around the food area so they can face wash
Because it wants to not be so scruffy and kind of groom its face!
Rub dirty socks on your face, or rub somebody elses smelly feet on your face.
If it is on hard wood floor spit on the floor and rub your shoes in it to get a grip on the floor.
because it likes the smell of the floor or wall
Get magic eraser and rub on floor until gone. If you get permanent marker on granite, get nail polish remover and rub until gone. If you get permanent marker on your skin, get a magic eraser and rub.
If you have an aerosol you spray on your hand then rub on your face. Be careful to NOT spray on your face.
it burns you.
lick the floor until it is clean. or pee on it and rub it off
rub it on your face
To your dog, you are his territory and he is marking you, making you "his".
fall on the floor because they want cheese
tell them to stop doing it orend the friendship