In general, I reckon that if you get EMOTIONALLY attached to a SF primary you want to buy, you WILL spend more on it than is financially optimal, and it WILL hurt your Debt To Income ratio and therefore slow down your ability to buy more bargain multi-plexes at whim.Will your extra retirement income wish, vs your pretty-home desire, be easy to resolve? 

PTSD does NOT require a service dog, but maybe an emotional support PET.

The guys wife seems to be more emotionally stable, because he keep emailing me accusation after accusation saying I'm volatile, have a bad attitude and am defensive, etc. 

Check out Emotional Support Animals & Waivers of "No Pet" Policies: What Does the Law Say?

Greg is dedicated to his client's needs and emotions, leading them confidently in finding the best investment opportunities.

This is a tennat you must get rid of asap.If you have issues with emotions in dealing with tenants you should consider hiring a PM.

Look for reasons NOT to purchase and no emotion in the purchase. 

Service dogs cost up to $25,000 but emotional support animals could be any type of animal with zero training, which is typically the case.

The bank might not even know the seller has moved out.This alone can kill a short sale approval depending on loan type.From my experience listing short sales years ago in the beginning the seller is all for it.Once the bank probes them and pokes them for more and more documents etc. the seller wears down.If the seller moves out they have almost 100% guaranteed emotionally moved on.If you have cash you CAN approach the bank to buy the note for a discount.You would need to know foreclosure laws for your state for the costs involved to foreclose among other things.It sounds like you are a regular home purchaser and you need to look at other properties.

(sorry there weren't any ducks, just chicken emotes)