2 girl dogs

Question
I have 2 female dogs and when even 1 is left on a leash together they will attack each other until my dad breaks them up or until one of them dies! Yes i am only 11 but my dad has left for a while for his job and we cant put them on a leash and the oldest one shrs almost 10 and she shows her teeth and snaps and growls at my 3 year old the10 year old is a snosher mix and the 3 year old is german lab AKA german shepherd lab mix but shes little cause she is the runt i thought that it was because of the breed but, German shepherds are usall the aggresive ones and shell only growl if sarah lou (the 10 year old) growls first! I know alot about dogs and i just cant figure this out! i need some help i dont want my dogs to get hurt its happened before! sarah lou got in a fight and started it with my old dog bogey he almost killed her! but i hink its sarah lou is the one thats starting everything but i dont want to put her down yet shes also got cancer and i dot want to let her go ive had her since i was 2! please help me!

Answer
Usually any 2 dogs will get along fine.  Often if they don't it is 2 females.  If they were both spayed it would help.  Good leadership would help.  4-H dog training is a great idea if it isn't too late for this year. In my area, clubs form soon after the first of the year. Even many urban areas have 4-H. For info look in your phone book under government listings for extension or cooperative extension offices. Ask specifically about a dog or canine club. The 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 a treat. Start at http://www.dogsbestfriend.com/ For more on being top dog, see http://www.dogbreedinfo.com./topdogrules.htm