Discipleship Parenting wrote a Letter to Dr. James Dobson. It is a lovely letter, you should take a look at it. In it she gives a testimony of how his teaching on spanking hurt her family and how they found something better.
She got a reply from Focus on The Family defending their stance.
She then wrote another letter where she explained further how his teachings are damaging and dangerous.
She received another reply from Focus on the Family which reiterated what was said in the first letter.
I highly recommend that you read these letters.