F1ach: Sorry to hear about your dog :(
Just thinking of the time of year, could your dog have got near some antifreeze eg. licking at a pool of water on the road? How about getting at some chocolate, that is really bad for dogs.
Hope your dog gets well soon.
Definitely no anti freeze or such, this dog wont even go for a pee outside the garden unless she absolutely has to go. And when she has went short walks recently we keep an eye on her, for a large dog who's breed was designed for hunting lions she jumps at her own shadow so we have to keep an eye out for basically everything.
She did eat a bit of a plant in the garden that ill be damned if i can spell but i looked it up online earlier (thanks to my dear mom for knowing its name as she gave me the damn thing) and spoke to the vet and it shouldnt cause anything apart from some gas, took a cutting and the name to the vets for them to check. I suppose its possible she could have a reaction to it but she eats that damn plant every year, and every year i dig the fucking thing up and every year the bastarding thing grows back.