Just returned from South Dakota - Roscoe area. 4 of the six dogs are sick. Symptoms: not eating or eating little dog food, eating grass and vomiting, lethargic, will drink water. Haven't been able to identify something that the four got into that the other two didn't. One sick dog joined the hunt the 3rd/last day. No ponds the 3rd day. First dog started showing signs morning of last day. Other dogs later in the day and next day. 3 golden retrievers and a British lab. Will be taking my 2 goldens in to vet this morning.