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It depends on the age and the training the Dutch Shepherd has. Puppies can range from $800.00 to $2500.00 Trained adults can range from $2,500.00 to $30,000.00
As long as the puppy is well socialized then the dog should get along perfectly fine with other dogs of any breed. However, the Dutch Shepherd has an extremely high prey drive, so supervision around small dogs is a must.
Some of this will depend on the dog itself. Genetics do indeed play a huge role in how aggressive a dog is - toward people or other animals. You can socialize them if a dog has aggressive tendencies. There is always a chance they will behave accordingly. Some Dutch Shepherds come from very hard, aggressive working lines. Many of these will not do well in homes with other pets or small children. Just like any breed, some dogs get along easily with others. Some do not. You can't draw a generalization. If you're interested in adding a dog to your family, you would be wise to see how the dog interest with your other pets.
You need to contact your breeder. The Dutch Shepherd is a protective breed, but should not be down-right aggressive. Find an adult dog that corrects puppies. Allow the dog to correct the puppy for being aggressive. If that does not work, then you need to find a positive reinforcement trainer in your area and start going to classes a.s.a.p before this gets out of hand.
Some Dutch Shepherds from KNPV bloodlines can be very aggressive and confident. High aggression does not necessarily mean the dog is unstable or dangerous. Some lines are bred to be aggressive and aloof for police work, military and high-level sport. Sometimes, this aggression is inherited and in some situations is highly desirable. Changing the nature of your dog is difficult. It is important to assess whether the puppy is aggressive out of fear or just a very dominant female. A dominant female is going to be aggressive toward other dogs - particularly another female. You can learn to control it, but you will likely not eliminate this type of aggression.