When I bought the plugin for the first time, as adaptil didn’t work, I was given a small free sample of the spray . It is a miracle recipe, works a treat. I have 5 dogs and the youngest can cause havoc sometimes. When they are all barking at each other and I feel like pulling my hair out, I just spray a couple of times in the air. They start to drop like flies. It’s amazing. Quite funny to witness.