snake bites

I've got a rat terrier that likes to kill water moccasins and eat them. First time he got bit he swelled up and I gave him a syringe full of liquid Benydril. Took him to the vet and they gave him more benydril and charged me several hundred dollars. Now I just give him benydril if I catch it early. If not I just let him tough it out. My older cur got bit on the lip last year and it swelled up a little but he was fine. I think it depends on the dog. I'm sure some could have a bad reaction and die pretty quick but I doubt you'll have time to save those anyway. My dogs are in the woods everyday of the year, whether I'm huntin or they're running around at the ranch while I'm bailing hay or they're running around the little creek behind the house.