Hello again everyone!
So, our little Vino is a bit over a year now, and he is the sweetest little monster ever. Sadly, our little baby suffers from severe separation anxiety and it's a bit heart-breaking.
If he thinks for even one second you are leaving him, he will bark and whine, and now he's started biting like crazy and his little bottom jaw keeps going like he's keeping the engine warm.
If anyone goes near the front door, or says bye, or hugs, he starts freaking out and jumping; thankfully he doesn't bite at this point.
We take him in the car every day since he stays at grandma's during the day. During the ride, so long as no one is around our car, he is a perfect angel; snuggles with us, watches out the windows, and has no issues.
However, if anyone walks by the car, or we go through a drive-thru, he starts barking at them, and jumping around, and if you try to grab him to stop him, or move him, bye bye fingers.
He is even worse when he thinks/knows one of us is going to get out of the car. We reach for our seatbelt and he goes right for our hands to try to stop us. He will do everything to try to prevent us from getting out of the car.
We've tried a bunch of different things; verbal commands, restraints (harness to belt), crates/seats, pheromones, loud abrupt noises to startle him, etc. Things work initially, but he becomes desensitized very quickly and continues to go absolutely nuts.
My wife and I do not mind the barking and whining, his whines/grunts are so freaking cute that it's ridiculous; the biting we need to stop though.
That all said, aside from leaving him home and not bringing him with us everywhere (which isn't an option cause he's our baby and he'd still have his anxiety), we don't know what to do. My wife has even thought of getting him a little muzzle just to prevent his biting when in close quarters (AKA car rides), but we don't ever want to do anything to hurt him, but there is only so much we can take of him hurting us.
What are your thoughts, is this really something someone can retrain in him, what can we do? He loves us so much, and we love him even more, and it's sad that he has to go through this, my wife and I are no strangers to anxiety, and we want to help him anyway we can.
As a bonus, here is some pictures of our little guy
https://imgur.com/a/2eZGddo
Thank you all in advance for your time!