Pheromones are airborne chemical molecules that are secreted by insects and animals to communicate with their companions. Common pheromones include alarm and sex pheromones, and food trail pheromones.
Dog appeasing pheromone (DAP) products mimic the pheromone that nursing dogs release to comfort their puppies.
Dog appeasing pheromone (DAP) diffusers like the Adaptil Diffuser and the ThunderEase Diffuser Kit are plugged into an electrical socket in a room that the dog spends most of its time.
Studies on the effectiveness of Dog Appeasing Pheromone (DAP) collars have produced mixed results.
A 2010 study "suggest that the use of DAP could decrease separation-induced anxiety, distress, and fear in inpatients, and possibly facilitate recovery in hospitalized dogs."
A 2015 study on the use of DAP collars in shelter environments did not found them to be effective.
A study to see if DAP collars helped Beagles who suffer from noise-induced fear, also found that "both global and active fear and anxiety scores were significantly improved during and following thunder compared with placebo."