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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.
Dogs should be house-trained as puppies; 3 years old is very old to start training the dog. It is sometimes said that you can't teach an old dog new tricks. I would suggest that the dog should be kept outdoors, in a dog house. If the dog house is small (which would normally be the case) the dog will not foul it.