Instruct: Classify a review as either positive or negative.
Query: Review of Understanding the Horse DVD

The author is an anti-science and anti-modern medicine type who says not to vaccinate horses. He also thinks parasitic infections in horses are natural and horses should not be given worming medication. He doesn't think that horses benefit from a walk-in shelter from the rain. I recommend NOT buying this video. Vaccinations are a triumph of modern medicine.