Herding breeds like border collies are the masters of this game, which is why you’ll see a ton of them at trials, but they’re not the only players. Chihuahuas, pit bulls, huskies, hounds, even Great Danes. You name it, my dogs and I have probably been shown up by it at some point. Surprisingly, certain toy breeds like Papillons have a real knack for agility.
Seesaw: This obstacle looks just like what you might see on a playground, with one plank supported in the middle, so that either side can be lowered toward the ground. The dog will start at one end and walk to the other, while the plank shifts with the dog’s weight. Some clubs require that this obstacle have grips or treads on them, as a safety measure.
Tunnels: There are a couple of different types of tunnels used in agility competition. One type is a tube with a U-shaped bend that is made of joined rigid hoops. Another style consists of a stiff collar-like tunnel, usually only a few feet long, that has a length of fabric fastened to one end. The dog goes in through the collar portion and must find its way out from under the collapsed fabric portion.
In recent years, a new form of Obedience competition, known as Rally Obedience, has become very popular. It was originally devised by Charles L. "Bud" Kramer from the obedience practice of "doodling" - doing a variety of interesting warmup and freestyle exercises. Rally Obedience is designed to be a "bridge", or intermediate step, between the CGC certification and traditional Obedience competition.
Remember that training is an ongoing process. You will never be completely finished. It is important to keep working on obedience training throughout the life of your dog. People who learn a language at a young age but stop speaking that language may forget much of it as they grow older. The same goes for your dog: use it or lose it. Running through even the most basic tricks and commands will help them stay fresh in your dog's mind. Plus, it's a great way to spend time with your dog.