PetArmor Flea & Tick Collar for Dogs (One Size) – An adjustable flea and tick collar that provides continuous protection for up to 6 months. The collar is infused with insecticides that kill and repel fleas and ticks (including those that may transmit Lyme disease). It’s water-resistant and fits most dogs by trimming excess length. This fuss-free collar is a convenient way to keep your dog protected from parasites around the clock, especially during peak flea and tick season.