The picture you paint of your dog leaves me with the impression that... If he were to get loose and Animal Control caught him, they would probably put him down. So, here it is: Tough Love v1.0
(I'll appologize in advance.)
@sandy-hovis said in Hyper reflexive Aggression and startle:
Even at 10 weeks old, He presented with this behavior.
IMHO, his aggressive behavior is largely a result of your interactions with him. First, you chose to allow him to behave this way when he was a baby. This would have been much easier to deal with then.
He does sleep nightly in his crate.
You thought if you tiptoed around him when he was asleep, then that would be all you had to do. And at some point you decided to put him in the crate at night. Sleeping in his crate is preventing him from protecting you, one of his strongest instincts. If you are afraid of having him out of the crate at night, start draping a lightweight blanket/sheet around his crate to create a cave-like den (to make him feel more secure). Then, instead of letting him wake up in panic mode, start talking to him when you wake up. "Good morning Thor"... you don't have to be a loud, just normal, "Thor, are you ready for breakfast?" You need to be consistant. If he is still in a panic, reassure him that it's ok and when he his calmed down he can come out for breakfast. Eventually, I think he should be sleeping with the crate door open.
Trying to take something from him, ... Ex: he gets something he knows he isn’t suppose to have, will bring it and shows It off....runs away. The chase is on.....
Again, this is related to your behavior. Thor thinks you are playing a game with him. A game should be fun and end with laughter and belly rubs and "good boy's". But you don't look at this like a game and it sounds like it turns into a fight.
First, anything the dog should not have should not be sitting out where Thor can get it. This includes shoes, remotes, your food, etc. Yes, I'm suggesting that you clean instead of punishing your dog for understanding the difference between his and yours.
Second, in order to keep your dog safe, you need to teach Thor to let go of things on demand/command. "Drop!" should result in an instant release no matter what it is. Example: chicken bones. Cooked chicken bones can splinter and create medical injuries (even death) for dogs. If Thor would happen to be on a walk and find one, you need to be able to say, "drop", and have Thor actually drop the chicken bone. Or, if needed, allow you to open his mouth and insert a finger to remove it. I don't get the impression that you would be able to do either right now.
All the while we have continued with a positive attitude that he will settle with a calming and soothing approach regarding all of this unsavory behavior.
ummm, excuse me.... I'm sure you are already offended at what I've written, but it seems pretty obvious to me that you need to teach your dog how to behave. Start with either one hour long walk a day, or two shorter ones. Every day. On a leash, where your dog is allowed to snif and smell, but also expected to learn how to sit and wait while you say hello to a neighbor and be polite around other dogs. Your daily walk creates an environment that promotes bonding with your dog. He will learn that you are in charge, not him (which is what you've been teaching him up to now). He will also get the exercise he craves and the socialization he needs.
Please, this is important. You have already accepted that you and your husband have allowed the behavior. Isn't it time to do something about it?