I'd really appreciate knowing if and how having an emotional support animal helps with BPD symptoms, especially overcoming depression and SI. 

Does it make a significant make-it-or-break-it difference, or is it just one of many things that may help?

UPDATE: we've had our new dog for 2 weeks now and I can definitively answer that YES an emotional support dog is a major help. Our whole family has had their spirits lifted. Two thumbs up. 