SENTRY Good Behavior Calming Collar for Cats, up to 15-in neck, 3 count - Chewy.com
SENTRY® Calming Collar for Dogs | Sentry
Amazon.com : SENTRY Calming Collar for Cats, Up to 15-Inch Neck, Includes Three Cat Calming Collars, Lavender Chamomile Fragrance : Pet Relaxants : Pet Supplies