It is for two reasons that dogs are bred with fluffy tails.
To begin with dogs were bred to have fluffy tails because they worked in very cold places where a fluffy tail would help keep them warm.
When these dogs slept they curled themselves into a ball and wrapped their fluffy tails around their heads to make themselves as small as possible.
The second half of my list is composed largely of working breeds of dogs.
In the first part of my list most of the breeds are smaller breeds.
There are not any fluffy tails on these dogs because it helps them stay warm.
They have fluffy tails because it completes their "look".
The dog looks cuter or more attractive with a fluffy tail.
Speaking of which let me go through my list.
The Pomeranian is my first breed.