I assume you mean after you have napalmed the whole area ? (not a fan of snakes!)
I'm not a vet, but asked the question of my local vet some years ago. He told me to carry some Piriton with me. Give the dog one immediately after the bite and get it to a vet.
Had a dog bitten by an adder a few years ago. She went on point then smack right on the lower jaw. So what did I do?
3. Introduced adder to 150 grain high velocity .308 (I thought it may be needed at the vets for identification and I wasn't picking it up aliv
ILB
1. Keep dog calm
2. Get to vet who will hopefully have antivenom
do not use tourniquet unless you like 3 legged dogs!!