Both what SirDrakeof theCreel and DPU are telling you is true ... but let me see if I can break it down to 'reality' a little bit more.
first off -- PetSmart is probably a really *bad* idea. Training is good, *but* not in a high fear, high anxiety environment. Because altho he might learn one 'new' thing, the whole trip is SO high stress for him that it sets him way back.
The hard part about this for you is that it requires ultimate patience - VERY slow training. One tiny little thing at a time. Play with him at home -- rather than taking him out of the house on excursions that will heighten his fear. Limit his exposure to people --
No I'm not saying not to work on his issues. What we're telling you is to literally work on ONE thing ... one tiny, small, very minute thing at a time. If you have a friend over **for the purpose of helping Misha** then work on just that. Otherwise keep Misha in a "safe place" (a crate or where ever you have established a 'safe' zone for this dog).
In other words trying to turn every outing into 'training' isn't good. It swamps the dog with fear. It makes the dog afraid of ***everything*** constantly and more and more unpredictable behavior will result.
"But it will take FOREVER" -- yes, it honestly will. But if you want to keep this dog and help it be whole and mentally healthy that's how you have to do it.
If you take things one tiny step at a time you will make progress. REAL progress (not the 2 steps forward and 3 steps back kind -- and that is *really* no progress at all if you figure it out!)
But yes, it means that the dog has to miss out on potential "fun". But look at it from the dog's point of view. If every time you go out you're afraid -- you're sick to your tummy sort of fear, you know your humans are upset with you and exasperated and you feel like not only are you afraid of *everyting* but you aren't pleasing your humans as well?
That's harsh! That's NOT fun. That's torture.
This is why everyone is recommending you do things very slowly. You only take the dog to new places where you can control **ALL** that goes on. Not PetSmart where strange dogs that are aggressive may zoom around a corner or where small children may leap at the dog and try to scare it or pet it improperly.
YOU can't control anything in a public place like that.
Let me say it this way -- you probably have a whole list of things in your own mind that you'd like to do with *your* dog. going to a park, PetSmart, meeting friends and having a party or get together.
But for ***your*** dog -- those things aren't fun right now. They are scarey. How would you feel if your friends or your mate only wanted to do things THEY thought were fun but never things you were comfortable with?
What if you were afraid to swim and all your friends wanted to go to water parks, pools, ponds and kayaking!!
Yes, you might try to work on your fear, BUT you wouldn't want them to turn every outing into a nag-fest trying to FORCE you to be UN-afraid and making you generally feel horrible before you got home?
then, before you got a chance to address the swimming issue, your friends/mate wanted to do something else that scared you (maybe going to catch snakes, or playing in traffic? or some other thing that you really didn't enjoy).
What if every single time you got together with your friends and your mate THEY wanted to force you to "work on your issues" ALL the time, but you never got to relax and do things in your own time?
As humans, we can logic our way thru things and can be a bit more successful in dealing with our fears so the comparison really doesn't hold true. A dog isn't in control of their environment when they live with humans. They can't 'choose' to do or not do a thing.
Instead, they have to trust you to take care of them.
Am I making any sense? Slowing down to train these issues one small thing at a time means it will likely take years to bring this dog to normalcy. It's a long term project. But it can be done. With *patience*. But it can't be done in time for the Labor Day picnic, or to go to the dog park with friends.
Forcing the issue will likely bring an end to the relationship really quickly. You will likely wind up giving up the dog and the dog will either wind up euthanized or in a very difficult situation with little understanding or love.
It's obvious you are stressed about this -- and it can be difficult to work your way thru it. "I just want him to be normal!!" -- that's what we all want. But the road to normalcy is usually one that you have to travel slowly and carefully.
I hope I'm making sense to you. I'm not meaing to be condescending -- only helpful.