jealosy (new dog/established dog)

Question
Our dog Madelynn (black lab) was 3 yrs old when we got Celia (full bred german shepherd) as a puppy..11 wks old.  They got along wonderfully at first.  Madelynn adopted the 'motherly' approach and helped Celia learn the boundaries here.  We live own a 3 acre property with woods all around us.  Madelynn also taught Celia some of the basic things to do and not to do.  It was amazing to see.  She slowly (it seemed as Celia learned) made the boundaries larger for Celia.  Til now..they are inseperable.  Good friends.  Together all the time...romping around the property and checking out the countryside together.  The problem is that Madelynn can be very mean to Celia as well.  When they are both put in a large outdoor fenced in kennel we have for them, Madelynn will bite/snip at Celia til Celia howls, when Madelynn sees us coming toward the kennel (outside kennel, large 6 ft area outside attached to a shed where they can go inside for shelter).  I realize this is dominance on Madelynn's part.  We have had Celia for a year now.  Is there any way I can help this to get better?  I feel so sorry for Celia when Madelynn does this.

Answer
2 females can be tough to make get along.  As Celia reaches maturity at 3 years, it could get worse.  Spaying both if not already will help.  So will strong leadership on your part.  

The key to most behavior problems is approaching things using the dog's natural instincts. Dogs see all the people and dogs in the household as a pack with each having their own rank in the pack and a top dog. Life is much easier if the 2 legged pack members outrank the 4 legged ones. You can learn to play the role of top dog by reading some books or going to a good obedience class. A good obedience class or book is about you being top dog, not about rewarding standard commands with a treat. Start at http://www.dogsbestfriend.com/ For more on being top dog, see http://www.dogbreedinfo.com./topdogrules.htm