Scooter probably has phantom pain . No experience with that since Chloe didn't go through it post amputation.  It't highly unlikely that he "freaks out" because his leg is gone.  Dog's don't have the same emotional attachment to limbs like we do.  Makes it easier for them to bounce back post amp  unlike us emotional humans.

From reading the forums on other dogs with phantom limb pain, Gabapentin is the drug of choice.  Recently Sammy went through this and he eventually recovered.  Here is a link to that forum.  If you scroll about half way down Sammy's family (fightingforsammy) discusses first issues with phantom pain .  If you browse through the rest of the forum, you will see he no longer experiences phantom pain  

Good Luck!

-Chloe's mom

Yoda had episodes very like what you're describing.  In his case, it subsided before I figured out/learned here that it was likely phantom pain and could be helped by Gabapentin.   Luckily for Yoda, I don't think his episodes lasted more than 5 days, peaking around day 3 and then dropping off to I think never again.  But it really varies, from what I understand, so you probably don't want to count on them going away - it's just too hard on your pup and you.  If I had it to do over again I would have insisted with Yoda's vet that we try Gabapentin.

I actually had it to do over again with my dog Gerry, who came next and I fostered through his amputation (adopting him later).  And I think he had some episodes too, though his weren't as clear cut because he was having other issues at the same time, with his tummy and reacting to his pain meds in various ways.  Still, I did try to talk the shelter and their vet into getting him Gabapentin, but I was overruled.  I think a fair number of vets yet don't believe dogs are capable of experiencing phantom limb pain (like it's some higher function only human brains can do), though in the case of Gerry's vet at that time, she believed it was possible, but didn't believe any kind of medication can help.  Well, tripawds owners here say differently, as does Pam in the Ask A Vet forum and she's a professional.

Gerry got past his episodes.  However, unlike Yoda, I suspect he has had an episode of phantom limb pain since, but only once.  I took him to see a chiropractor soon after an episode of inexplicable crying out and that was the chiropractor's guess, as he couldn't find anything wrong with him.  I haven't sought medication for him yet, since it has been so rare so far.

So that's all the input I have.  Best of luck with it and don't forget to take good care of yourself too so you're strong for Scooter!

Yep, sounds like phantom pain , Gus started about 5 days post op, sounded like he got hit by a car, and at 3:30 in the morning it doesn't do much for your sweet dreams, but as we all know at this part of the journey you don't get much sleep anyhow. We started him on gabapentin at that time and I think it helped but it didn't completly take it away. His lasted about 3 weeks, with the episodes getting milder as time went on. He would have maybe a couple a day. I just stayed with him while he was having them and he seemed ok once they were over, but they will tear your heart out whille they have them. Good luck, paws up, spirit Gus and Dan