I don't know about the exact dosage for gaba but if it doesn't appear to be working you should call your vet to see how you can come up with a more effective dosed. It's a drug that's only recently begun being used for dogs and phantom pain , so I can see why s/he was unsure about the exact amount. I hope it works for Frankie! Keep us posted.

Let us know how it goes. Please remember to ask your vet about how to withdraw him from gaba when he no longer needs it. I understand that it's not the kind of drug you should stop giving all of a sudden. I hope this works for him, it's so hard to know they're in pain.