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Adaptil Calming Dog Collar The?Adaptil Collar?is easy to use and convenient as it releases the dog appeasing pheromone constantly (even when the dog is outside). The dog?s body temperature and close contact warm the collar and encourages the diffusion of pheromones into the local environment. It is essential the Adaptil Collar is in close contact with the dog?s skin at all times. This collar is for smaller dogs/pups: puppy/small dogs (fits neck up to 37.5cm) Each collar lasts up to 4 weeks and can be replaced as required.