Before buying a dog collar, measure the dimensions of the dog around the neck. The  collars are available in most pet stores. Plain leather and nylon dog collars are the most commonly used varieties. A good dog collar costs between $10-25 . If the collar does not fit properly, you can exchange it for a more suitable model if you preserve the receipt and do not remove the tags.  Take a test walk with collar fitted on the dog to confirm that it is appropriate.