Have you ever heard of the dog breed called a Spitz? They often have white fur that is long and thick.
No ,its good to know that.What type of dogs are they?
They are like a pomeranian. The tails on a Spitz usually curl over the dogs back or sometimes it droops.
What country are the mainly found?
Well the Spitz today mostly originate out of Siberia. Their exact origins arent really know though.
What are their main characteristics? Are they like friendly?
The Spitz have pointed ears and muzzles. Their fur is typically white, thick, and long. 
What does their fur help them do?
To keep warm in Siberia. They have found Spitz skeletal remains that date 2000 years in Switzerland. 
Do you have one of those?