Our magnetic dog collar contains a powerful central reverse polarity magnet and the canvas finish is designed to be both comfortable and durable for your pet. Available in two sizes: small and large. The small collar is 16mm wide and fits neck circumferences up to 45cm. The large collar is 20mm wide and fits neck circumferences up to 65cm. If required, the collar can be trimmed and heat-sealed with a naked flame to prevent fraying. These collars can be worn by microchipped dogs. Our canvas dog collars are water resistant and will withstand exposure to rain. They are not suitable for prolonged water exposure or submersion, such as showering, bathing, or swimming. Please note: We advise that you do not allow the collar to come into contact with flea treatment chemicals. We recommend removing the collar during treatment and keeping it off until the fur is completely dry.