NurtureCALM 24/7 Feline Calming Pheromone Collar (Upto 15" Neck) by Meridian Animal Health

This collar is well worth the money. I had even tried transdermal Zoloft on my cat. Put this collar on and he stopped biting me! It’s like a miracle! Calmed him right down. I highly recommend this product. I have to change it between three to four weeks.