I don't recommended trying medications on your dog without consulting your veterinarian first. Your dog's life is in your hands. I know money is tight, but wouldn't you hate to make a mistake and have your dog fatally ill or die because you didn't just take her to the vet or emergency clinic from the start?
I can come up with a very rough ballpark dosage amount based on my Mom's dog. But, I would feel terrible if I gave you the wrong dosage and your dog got worse or died because you took my advice. Please, just take your baby to an emergency clinic instead!