>>4351778>http://amp.slate.com/articles/news_and_politics/explainer/2004/02/why_are_poodle_haircuts_so_weird.htmlThey're water retrievers. The shaved down parts are to cut down tread resistance in water, and the fluffy parts keep the dog's joins, head and vital organs warm so they can hunt in colder water.
A lot of poodles love water so much that they'll try to swim in their water dish when they're puppies.