Bob Martin Tick and Flea Collar for Dogs is a highly-effective and affordable solution to fight against pesky fleas, ticks and mites from attaching to your furry friend's coat. This collar is designed to keep your dog protected for up to four weeks, making it a reliable and long-lasting parasite protection for pets. Made with high-quality materials, the collar is formulated with an active ingredient, propoxur that repel fleas and ticks from clinging onto a dog's coat and protect against mites, ultimately preventing health problems resulting from tick or mite bites or flea infestation. It’s a one size fits all collar and suitable for all breeds of dogs.