For medium and large breed dogs. This insect repellent collar with Geraniol, a powerful plant-based active ingredient, effectively repels parasites. It gradually releases the active ingredient which activates, 48 hours after installation, optimal protection for your dog for 3 months without affecting his olfactory sense. Water resistant. Brown color. The insect repellent external antiparasitic collar allows: To repel parasites. To provide a reinforced repellent action thanks to Geraniol extracts. To act in a few hours. To respect the olfactory sense of the animal. Water resistance.