Diet Snapple fact #140 says: Holland is the only country with a national dog.

I know you want to know the answer, so here it is:

Holland's national dog is the Keeshond, also known as Wolfsspitz (inGermany), Chien Loup (in France), or Lupini (in Italy). Originally,the Keeshond was a watchdog on Dutch canal barges, riverboats, and farms, and it is still often used for this purpose today.