With the all the various choices of designer dog collars in the dog accessory industry, one basic rule of thumb has remained constant. The perfect collar for your dog is the one that is not too loose on the neck and not too tight to the point of choking your dog. Always make sure that the distance between your dog's neck and the collar is approximately as wide as two fingers. The fit of your dog's collar is important, but today your dog can also make a fashion statement.