I have had some experience with snake bite on a dog and saved it using the following.

Half a valium tablet to slow dogs pulse down.

1500mg of ASCORBIC ACID INJECTION(500mg in 5 ml's)David Bull Laboratories. May be administered I.M or S.C,

Keep the dog cool and relaxed.

Pat Colby is a goat lady and I believe that is whom I got the info from originally.

Saved my dog,so dont travel anywhere with my dog without my jar of goodies.

Iff it dont save the dog at least it is better than doing nothing !

Al