The Repul’7 collars imported and manufactured in France by AB7 veterinary industries, use the repellent properties of a natural active ingredient, Geraniol, to help protect from fleas, ticks and mosquitoes. The collar is designed to be effective for 3-4 months with a slow release The collar remains effective when wet. Fitting and using the Collar: This collar is 60cm and will suit medium sized dogs. Can be used on small dogs as well, just cut length to suit. Remove the collar from the sachet and fasten it around your dog’s neck so that two fingers can comfortably fit between the collar and your dog’s neck. Any excess length beyond the buckle should be cut off and disposed of in the normal household refuse. These collars are useful as a preventative and can be used along with or instead of other flea treatments. Now is the time to put them on your dogs. If you want more than one just chose the quantity when you place your order.