Head halters are an alternative to collars that works similarly to a horse halter. The halter fits over the dog's snout and behind its head (leading it to sometimes be mistaken for a muzzle). Halters reduce the dog's ability to successfully pull on the leash, but do not eliminate it. If the halter is used with a sharp jerk on the leash, neck injury to the dog may result, but used correctly head halters have not been shown to cause harm.
Martingale collars (also called limited-slip collars) are usually made of flat nylon with a smaller fixed-length section (made of either nylon or a short length of chain) that, when pulled on by the leash, shortens up tightening the collar around the dog's neck, to a limited extent. When properly fitted, martingales are looser than flat-buckle collars when not tightened, and less severely corrective than slip collars when tightened.
There is nothing inherently wrong with telling your dog “no,” except that it doesn’t give him enough information. Instead of telling your dog “no,” tell him what you want him to do. Dogs don’t generalize well, so if your dog jumps up on someone to say hello and you say no, he may jump higher or he may jump to the left side instead of the right. A better alternative would be to ask him to “sit.” Tell him what you want him to do in order to avoid confusion.

Money. Therein lies the rub. One of the drawbacks to training competitively is the cost. Between class fees and trial entries, this can be an expensive sport. That doesn’t have to deter you, though. Many clubs offer significant discounts on training and entries if you work at their trials, which was a huge help for me. I earned quite a few free or nearly free classes by working trials. The fees for junior handlers (-18) are also considerably more affordable.

In the twentieth century, formalized dog training originated in military and police applications, and the methods used largely reflected the military approach to training humans. In the middle and late part of the century, however, more research into operant conditioning and positive reinforcement occurred as wild animal shows became more popular. Aquatic mammal trainers used clickers (a small box that makes a loud click when pushed on) to "mark" desired behavior, giving food as a reward. The change in training methods spread gradually into the world of dog training. Today many dog trainers rely heavily on positive reinforcement to teach new behaviors.
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.

Even if your pup gets the best start in life, he will still likely develop some “problem” behaviors as he grows up. We put the word “problem” in quotes because most of these behaviors are natural and normal dog behaviors, but they are not welcome in the human world. Behaviors like jumping on you as a gesture of affection, nipping at your hands as an invitation to play, and sniffing you in inappropriate places are all perfectly acceptable behaviors for dogs to do to other dogs.
If your dog is refusing to go over a hurdle, practice in a narrow hallway. Set up a small jump and put your dog on one side with you on the other. Your dog should have nowhere to go but forward over the jump. Encourage your pup with treats and a happy tone of voice. With a little patience and positive reinforcement, your dog will soon be a confident jumper.
AKC Canine Good Citizen (CGC) evaluators are another class of dog-training professionals. AKC CGC Evaluators may or may not be trainers or behaviorists, but are certified by the AKC to evaluate dogs in the Canine Good Citizen test. Training other behaviors and getting a dog used to being alone, for example, can help reduce separation anxiety. The root cause, however, would likely need to be determined by a behaviorist, who could then refer you to a trainer if he or she was not able to help with the training issues.
Weave Poles: This one might be the most exciting element to watch a dog complete, but can be one of the most challenging to train for. If you’ve ever seen a ski slalom race, you already have a good idea of what the dog will need to do to get through this obstacle. Several vertical poles are set up in a row and the dog must weave its way back and forth between them in a snake-like fashion.
Dog intelligence is exhibited in many different ways, and a dog that might not be easy to train might nonetheless be quite adept at figuring out how to open kitchen cabinets or to escape from the yard. Novice dog owners need to consider a dog's trainability as well as its energy level, exercise requirements, and other factors before choosing a new pet. Very high intelligence is not necessarily a good thing in a companion dog, as smart dogs can require extensive daily mental stimulation if they are not to become bored and destructive.
"Training with John gave me the tools to better communicate with my pup. He is very patient, and willing to work on specific problems or challenges with each person with whom he works. My dogs behavior has improved in all aspects, and our bond is stronger because he understands what is acceptable and what is not. Thank you for helping me get there, John."