Trusted - used by vets, charities and behaviourists. Scientifically proven, studies to support all claims. SCENTLESS and Species specific - no effect on humans or other pets. Contains a synthetic copy of the 'dog appeasing pheromone' which a mother naturally releases to calm and reassure her litter. It has the same effect on adult dogs. The No1 clinically proven dog behaviorual product. Backed by over 25 years of science & research into pet welfare.