Ceva-Sac's Adaptil junior puppies collar is an effective solution to help puppies adapt and facilitate their education. Helps puppies to better adapt to situations and challenges that come their way: crying at night, being left home alone, loud noises. Promotes better socialization and learning. The collar fits necks up to 37.5cm and can be used on puppies up to 15kg. Duration approximately 1 month. Be sure to provide continued support for your puppy during the socialization period (from adoption to 6 months) by wearing a new collar every month. It is recommended to put the collar around the puppy's neck and adjust it. The puppy must wear the collar at all times (except during the shampoo bath). Adaptil has no side effects or contraindications. It is not a medicine. Store in a cool, dry place, away from heat and moisture.