Leash and Collar
It may seem surprising, but the leash and collar are the simplest and most effective tools for training your dog outdoors. As far as the leash is concerned, the shorter it is, the better control it will give you. Also available at pet stores are automatic recoil leashes, wherein you can adjust the length as and when you desire.
Dog fences are essential when you want to contain the dog to your premises, so that you don't have to deal with annoyed neighbors. Apart from the conventional fences, electric dog fences can be very useful for this purpose. The invisible fence will train your dog to refrain from venturing out by delivering a mild electric shock.
The shock will be preceded by a beep, which will be a warning sign, and the dog will eventually start associating this beep with the danger of crossing the line.
A clicker is a small plastic device with a metal piece inside, which, when squeezed and released, produces a clicking noise. This device can be useful when you are training the dog to follow commands and instructions, as the clicking noise will attract the dog's attention towards you.
The dog will also be able to recognize this noise after a few days of use, which will enable you to track your dog, in case it goes wandering about.
Other than these training tools, you will also have to resort to dog treats to ensure that your dog takes interest in the training process. These treats encourage dogs to follow commands. The treat should be something that is not included in the dog's daily diet, like liver, chews, biscuits, cheese bites, etc.
The desire to earn a reward will encourage your dog to perform the task properly. To produce the desirable behavior, you need to make this training an enjoyable experience for your dog and treat it with love and respect.