The Beaphar Canishield Flea \& Tick Collar in size S \& M is a highly effective and convenient solution for protecting your dog from fleas and ticks. This collar is infused with the active ingredient Deltamethrin, which provides long-lasting protection against these pesky parasites. Designed with both safety and comfort in mind, the collar is suitable for large dogs. The adjustable size ensures a snug fit, allowing your dog to move freely without any discomfort. The collar is also water-resistant, making it perfect for dogs who love to swim or play in the rain.