Dog Pheromone Calming Diffuser Kit, Calming Diffuser for Dog (2 Plug-Ins & 4×48ml Refills) for Stress Support, Helps Reduce Barking & Aggression, 120-Day Supply (Non-Toxic, Safe & Inedible) Duck Diffuser (with Light) is up for auction in Pet Supplies. The current bid is $1.50, 93% below the $22.99 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.