I called my Dad and asked for an update on Topper, his dog that decided to munch on the sego palm. Apparently, without any vet intervention, Topper pulled through!
Dad, of course, has theories- remember he read about all these pups who died after eating sego palms.
1) Topper is a much larger dog than the dogs he read about
2) Taking dogs to the vet and putting them on IV's etc probably put the dog into shock after already being in a bad condition
So, that's the farmer's son's theories.
Bottom line: Daddy still has two doggies!