Is a 4 yr old Male too old to house break?

We have just taken on a 4 yr old male Maltese. He has been kept outside in a fensed yard most of his life and is not House broken. We want to clean him up and make him into a house dog that will poop outside.

We have had a Maltese in the past, raised from a puppy and we trained the dog to live in the house and bark at the door when he wanted to go outside. Is it too late for a four year old dog? We also put our dog through a 4 week training coarse where he learned about 10 commands and to heel. Can we do this with a 4 year old dog. Can we change the dog's name?

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