Tweeti'd cut his ass open and get my fina if i could, but since it was a powder you might be out of luck
On a serious note I have no idea what will happen to the dog, thats a whole lot of fina for a small animal to ingest. Don't know what a dog's digestive track is like either, if you live in the country you may want to bring it to the vet, if you live in the city, the vet might be curious as to how it ate a cart of fina.