DS1 suffers from chronic and acute anxiety. Our last dog was PTS 3 months ago at the age of 13 and DS1's mental health crashed. We are picking up a new puppy at the weekend. This will be our 5th family dog and will, in any case, be highly trained. Can he be trained to be an assistance dog so that DS1 is not alone if and when he leaves the house? DS1 struggles to leave the house atm even working with OT and a counseller. If this is possible, how would I go about it?