De or het strandwolf?

The correct Dutch article is:

de strandwolf

How to use strandwolf

the strandwolfde strandwolf
this strandwolfdeze strandwolf
that strandwolfdie strandwolf
our strandwolfonze strandwolf
your strandwolfjouw strandwolf
every strandwolfelke strandwolf
which strandwolf?welke strandwolf?
a big strandwolf / the big strandwolfeen grote strandwolf, de grote strandwolf