Fact 1: Preventing the transfer of heat from an organims 's body causes that organism to keep warm.

Fact 2: Body heat is trapped in the haircoat.

Given the two facts above, answer the question "The haircoat of a dog is useful for" with the following options: 
- recovery time from fatigue
 - When it's cold
 - protect them
 - finding bones
 - preventing dog days
 - keeping the dog warm
 - keeping the dog cool
 - water conservation


 

      keeping the dog warm   