Size:Medium - For pets 15 pounds to 50 pounds Our pet tag sensors are magnets and therefore waterproof and do not require any batteries. It is important to order the pet tag sensor size designed for your pet's size, so the pet door operates properly. Large dogs stand further away from the pet door, hence they need a larger pet tag. The same principle works for medium dogs, as well as for smaller dogs and cats. The Small Pet Tag is for pets up to 15 pounds. The Medium Pet Tag is for pets 15 pounds to 50 pounds. The Large Pet Tag is for pets 50 pounds and larger.
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