Zenidog Calming Collars for Dogs Designed for everyday use, the collars are long-acting, slowly releasing canine appeasing pheromones and are proven to help reduce stress in dogs. Simply leave the collar on your dog continuously for 3 months Long-acting Lasts up to 3 months Convenient Two adjustable sizes for a stylish, comfortable fit: One for puppies and dogs up to 22.0 lbs, and one for puppies and dogs 22.1–110.0 lbs Can be used with flea and tick collars without losing efficacy Eco-friendly Packaged in a recyclable box
