Some Yorkies have Cottony hair that matts easily and some have Silky hair that is easier to comb.  Puppy cuts are just easier for some people to care for.  I take mine to a groomer and have him clipped to about 2 inches every 8 weeks over the winter.  If he seems hot over the summer maybe shorter and every 6 weeks.  I want them to leave his hair on top longer so I can put elastics and bows in them.  Baron Loves being dressed up...   
