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Young dogs can react unpredictably to electric dog fences, so understanding a puppy's development is essential to deciding when to start training the animal with the fence and collar. Generally, puppies should not be introduced to electric dog fences until they're at least four or five months old.
The most important part of installing a dog containment fence is training your dog to use the fence. Invest two weeks in training your dog to use the fence and you will have a happily contained dog. Without the training the system is worse than useless. Training is easy, all you need to do is commit to three fifteen minute session each day for two weeks. Here is a quick overview of the training.