I agree with everyone, especially pitchick. It will state in the contract if she can or can not breed him. If it says nothing about breeding him than she has no right to breed him, but why else would she state that he can not be neutered?

If it is in the contract I would tell the breeder that she can not breed until the dog has a complete exam, (xrays, bloodwork etc) to make sure your dog is in great health & poses no genetic health risks. Especailly hip & elbow dysplasia, eye & heart disease as these are the most common problems with goldens. But you should also check his background & blood to make sure there is no record of hypothyroidism, seizure disorders and other orthopedic disorders in his genetics.