Pam,
Your friend is right! It is amazing the insticts our domesticated animals still have in common with their wild side. Another interesting fact about the animal den, before the pups are old enough to go on their own outside the den, mom will lick the pups to stimulate them to pee and she will drink it and she also eats their mess to keep the den clean of odor. Just a word of caution for those of you who find this disgusting.... Never have a litter! This is the hardest thing to get use too.