When looking for a behaviorist find someone who uses positive training only.
I rescued a Rottweiler with aggression issues and a Dobe mix with aggression issues. My Rottweiler attacked me twice and my Sister once, not just a bite but an all out attack. I dealt with the Rottweiler in totally the wrong manner which was dominance based training. The training seemed to be working for her but what I didn't realize is it was only "suppressing" her issues and then when she did strike out it became much more unpredictable. Once I started seeing a behaviorist who used only positive training methods I was able to completely turn her around into an excellent stable dog. She had to learn to trust me as I had made her distrust me with the correction based training (I used all the worst training styles on her such as always saying No, holding her muzzle, lemon in the mouth etc which really was not smart at all). When I was leaving she would get really upset and would try to grab me as well and bark etc, what I did to resolve that issue was to associate my leaving with good things happening. I trust my dogs not to choke on RMB's so when I was leaving this is when she would get a RMB. Next few times I was grabbing my keys and jacket she would run down to the fridge quite excited knowing that's where her bones were. LOL I have done the same with my other rescues as they too both had issues as well. I redirected their bad behavior to something positive.
My Dobe mix when I first rescued him no one could touch his paws or pat him on top of the head. He was a highly fearful dog. We had to take baby steps and use desensitizing techniques and counter conditioning which worked excellent for him. He is now a wonderful stable dog that is one of the best for doing nails which is amazing as he was the worst and would just freak out and start air snapping and panicking etc.
With Beau I found that if you were standing up and tried to pat the top of his head or back of neck he would freak out. So I started crouching down and turning my head to one side which is a calming signal. Then I would put my hand out and rub his chest and belly and as the days went by my hand would go up further etc. It was took longer to desensitize him but I am so glad I used these tactics as this dog will now trust anyone with anything. He is so good now that my Vet said he is one of his best clients and there have been some procedures (to do with his eyes) that he normally would have put a dog under to do...not with Beau as Beau is now rock steady and no longer fearful at all. I was able to bring out some confidence in him which I am very proud of. A dog with confidence and not bullied will make you proud. Sometimes men can have a way of being a bully to dogs without really intending to be. Standing over top of the dog and coming down over them, well that would even freak me out and I can't say how I would react. I have found that you have to work up to different things, perhaps your wife is not patting your dog in what the dog perceives as threatening and perhaps when you are patting your dog you may be a bit more rough, standing over him and just basically putting him in a flight or fight stage.
I have 5 dogs all from different backgrounds who only came to live with one another when they were adults. All had their own little issues such as dog aggression, fear aggression, resource guarding etc. I am so pleased with how stable they have all turned out to be just by providing a good stable environment, routine, never confusing them and using positive training methods only. It makes me so happy to be able to see just how far they have come just with simple positive training
As mentioned I would never have been able to over come my Rottie's issues without the help of a good positive only behaviorist. She helped me immensely. There was a point I was considering giving Athena to a local Rottweiler breeder/rescue as she mentioned she had dealt with these issues before and she would have taken her.