Therapy Dogs for children with Autism

I searched for this subject and couldnt find anything recent on the subject.

I am looking for views and opinions about any advantages or disadvantages in getting a dog for a 12 year old with a diagnosed ASD. I have read many articles saying they can be good but i'd like to hear from people with real life experiences before exploring further. I'm not talking about a formal, trained "assistance dog", just a dog that can be home trained to be company for my son.

Thank you