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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.
Testing your fence when it is first constructed is always a good first step. This will give you an idea of what the fence voltage should be. Test your fence with an electric fence voltmeter.