Nut is right. You can order, but it takes too long.
Need a blood transfusion to keep the dog alive long enough to wait for the drug.
This is why I say (over and over and over and over and over and over again ...) ALWAYS HAVE THESE DRUGS ONHAND ... DO **NOT** WAIT UNTIL A LIFE-THREATENING EMERGENCY HAPPENS AND GET CAUGHT WITH YOUR PANTS DOWN. (But who ever listens to simple, effective advice? Doesn't apply to 'you' ... right? Wrong!)
Best you could do now is take him to an emergency vet (ESPECIALLY A LOCAL UNIVERSITY **IF** THEY HAVE A VET SCHOOL) and get Imizol in him right now.
But he needs a transfusion first, unless you can get the drugs in him now.
Good luck,
Jack