De or het kuitharing?

The correct Dutch article is:

de kuitharing

Rule Words ending in -ing: almost always de. See the rule

How to use kuitharing

the kuitharingde kuitharing
this kuitharingdeze kuitharing
that kuitharingdie kuitharing
our kuitharingonze kuitharing
your kuitharingjouw kuitharing
every kuitharingelke kuitharing
which kuitharing?welke kuitharing?
a big kuitharing / the big kuitharingeen grote kuitharing, de grote kuitharing