If your dog exhibits a behavior you don’t like, there is a strong likelihood that it’s something that has been reinforced before. A great example is when your dog brings you a toy and barks to entice you to throw it. You throw the toy. Your dog has just learned that barking gets you to do what he wants. You say “no,” and he barks even more. Heaven forbid you give in and throw the toy now! Why? Because you will have taught him persistence pays off. Before you know it you’ll have a dog that barks and barks every time he wants something. The solution? Ignore his barking or ask him to do something for you (like “sit”) before you throw his toy.
It's a good idea to proof your dog's training in different locations to prepare it for distractions. Invite a few friends over to cheer on your dog so it gets used to a crowd. You might also want to go to a training center or find local trainers who also have the obstacles set up in their backyard. If your obstacles are portable, you could even take them to a park.
A-frame: The A-frame is a pair of planks joined in the middle at an angle so that they resemble the peak of the letter A. There are “contact” areas indicated by contrasting colors which are painted on the frame and dictate where the dog must step. The dog must go up one side and down the other, contacting the plank in the right places on each side.
Second, it’s easiest to ignore unwanted behavior and reward an incompatible behavior. When Rover bites at your hands, he wants attention. He wasn’t born programmed to know that you want him to sit and ask nicely for attention, so you have to teach him. Instead of scolding him, ask him to sit. When he complies, reward him with a food treat, lavish praise and petting on him, or offer a game of fetch or tug.