What are my dog's chances?
I wish I could reassure you, but I honestly dont know what the chances are for this poor, unfortunate puppy. Bless you for doing the best you can under most unfortunate circumstances. I would encourage you to try and get some kind of retribution for your vet...
Removing Decals From A Motorhome?
Remove as much as you can (carefully) with a sharp knife. Then spray on some WD-40 and wait a few minutes. The remaining gunk should come right off, but the stubborn ones may take 2-3 applications.