Check to make sure the spray nozzle points towards the dog’s nose/muzzle.
Make sure that the collar is completely filled with spray.
Make sure your dog’s hair does not block the spray. If so, trim the hair so the spray can reach the nose/muzzle area. (CAUTION: Do not shave the pet’s neck area; this could cause excessive pressure on the pet’s neck).
Contact Customer Care for more troubleshooting help.