I have a two year old choco. lab named Molly. And I am in desprite need of a thearapy dog. I have stress issues and don't feel comfortable confiding in a human. So I'm simply wondering, is Molly to old to be trained as a service dog? She's uper mellow and pretty obedent. Or do I need to start with a pup? That wouldn't be a problem, But me and molly already have a bond... so any input?