There are so many models, no wonder you take forever searching for the right dog collar.  Dog Collars come in such various designs and materials that even the most elaborated web site will make your head spin with tons of options. Dog Collars are only one of many Dog Supplies needed for the safety and comfort of your dog.  Remember, for successful Dog Agility Training you’ll need Dog Toys, even maybe a Dog Harness. Some Dog Collars are Flashing or Reflective Dog collars & Leashes.  You can also find illuminated and lighted dog leashes and collars, all depending on what you really need. If safety is not your primary issue, and your are more into looks, you may what to get a fashion designer dog collars or leash.  For those of you with more classic tastes will also find available a collection of nylon dog collars & leashes as well as leather dog collars and leather dog leashes. A good Dog Training Tip is that depending on the dog’s age and maturity or even the Dog Breed Information you have, you may need a on those training Collars to correctly and simply teach you dog good habits.  Classic Training Collars will shock your dog with a 12 Volts electric discharge, sometimes harming it. Newer,more sophisticated remote citronella Dog Training Collars are proven to be 2X as effective and harmless to your dog’s health. The Citronella technology allows you to remotely trigger an air spray of Scentless or Citronella spray under the dog’s shin to correct misbehaviors.  The air spray is really annoying for the dog and immediately stops it from doing whatever it should not have been doing and trains him to listen to you.  That's just part of good Dog Obedience Training practices. The same principle is used to manufacture a Dog Barking Control Collar.  These Anti Barking Dog Collars combine the spay technology with a microphone to detect the bark and immediately “distract” the dog and stop it from barking. If you take this technology one step further, and install location sensors in the ground you can use the above system as an electronic dog fence for dog containment system to keep your dog in the yard or around their dog houses. For those of you that chain theirs dogs to it's Cedar Dog House, make sure to use a tuff nylon dog collar if you are not using an Outdoor Dog Kennel. Get advice on an active Dog Health and Dog Training Forum