Thank you very much Vin, the lower protein is only the dry food and he gets only a small amount of this, he still gets plenty of raw. And had a meal in the morning prior. He def is not fully working fit as he would be, say in the middle of the season, but is fit enough for what he did that night imo he did not have loads of runs and very few of them were grueling ones. I do think it was a combination of weather etc. Hypo does sound about right. much more plausible than a seizure or cramps....thank you very much
I know how worried you must be Moll..I thought my dog was fit when it happe