A clicker is a small device with a button that clickswhen you press it. Dogs can be trained to associate the click as a reward.
Food is a great reward, and I reccomend it when teaching tricks at the beggining. Later on when your dog gets good at the trick, you can use petting and toys and other less desirable rewards.
First you have to teach down. Take a treat and show it to your dog. Place it in your fist and make sure your dog knows its there. Get her to sit, the place your fist infront of her nose and lure her down into a down. When she lies down immediatly give her the treat and say,"Good girl!". You may also pet her.
Next, get her to sit and say, "Down" right after you giver her the command, lure her down. It takes over 100 times of diong this step before a dog can learn this trick. Keep doing it and never give up.
~Please Call Me Caiti!~