Did the vet DEFINATELY say it was some kind of poisening ? I ask, because you say the dogs were f****d, and it's a pup, (how old ?), and it seems like it had a stroke or some sort of aneurism. I remember LDR's dog, Billy had the same symptoms after a hard night on the lamp; fitting, and went blind. Had to be put to sleep. Hope this isn't the case here, and the pup makes a full recovery !
Cheers.
yeas they said its eat some sort of poison the dogs about 18 months old