She is 7 years old and we served together overseas.
I'd explore this aspect of it. You're not retraining a dog from scratch. You're not building a new relationship with a dog. This is a dog that already knows you, how your distress levels present, how to work with you individually as the handler...
I'm gonna go out on a limb here, and may be way off, but when you're out with this dog, as opposed to out on your own, does that change the presentation of your ptsd symptoms?
At 7, this dog will probably react to bomb detection for the remainder of its working life (which is likely 3 years-ish). But if you work with a
qualified trainer, they could tone those responses down, and amplify the way the dog works with you already.
As an example: having the dog probs may make you naturally feel safer, and the dog standing between you and other people, keeping them at a distance? That's called "blocking", it's a cinch to teach (especially a dog that has a history of working like this one). If that, all by itself, alleviates your ptsd symptoms? That's an SD task right there.
If this dog has been trained to display aggression in certain circumstances? Then it's a wash. Not gonna work. Not in the timeframe you have.
If you were to make a list of the major symptoms you experience, and the things that an SD could do? There's probably at least a few that you could teach
this dog quite easily to qualify as an SD.
Because this isn't an ordinary dog. And you already have a working relationship with the dog. The dog knows you, and you no doubt know this dog and what they're trying to communicate to you pretty well.
I can't
disagree with the "check out Youtube" suggestion more strongly. It's idiot central. Go to professional organisations that specifically certify SD trainers and get references from them for someone in your area. You will save a heap of time.
Youtube is now awash with every idiot with a dog and a phone that thinks their way of doing things is the shit. Go to the organisations that have accreditation and animal behavioural certifications. You'll more likely find someone that trains dogs using the same methodology that this dog is used to. Which is important if you want to work with a dog that's had a pre-existing worklife.
Once you've found a trainer that has the right skillset? They'll often have a Youtube channel or FB page that can refer to to supplement your work with them. But a random Youtube search? Unfortunately there's trainers on there that just don't know that they don't know squat. But there's also trainers who are so bad that they've had professional reprimands, licenses banned etc - but they get to keep using forums like Youtube and FB irrespective. Anyone can tell you "I've got formal qualifications and been doing this for 30 years...". If that's true? They'll have professional certification to back those claims up.
Working dogs switch careers very often. A professional, qualified trainer will be able to pull this off probably without a whole lot of hassle.