Snake Bites?

I lost a really good walker 6 or so years ago to snake biteS. the dogs bayed in a low water running creek and it took us quite some time to get to em. When I got there I could tell ol amos wasn't actin his self. Anyway I brought him home and noticed that his sides felt funny, kinda hard and tight in a way. the the next morning he was swole up on all four legs high and tight to his body......brought him to the vet where he passed away..... Vet said that he had been bitten multiple times........honestly though he did not swell up noticeably until the next morning....still scratch my head over that.... he was a my garmin for quite a long while! miss that ol dog.