(Lupi)Dog Harness (Medium) The amazing harness that stops dogs from pulling,no dog needs to pull on the lead. Lupi works by converting forward motion into an upward lift and so stops pulling.Simple to use and kind to your pets spine. Features; - Stops pulling. - Instant Results. - Simple to Use. - Kind to the spine. - Medium Size (600-800mm) - Recommended by Dr Roger Mugford.