my friend's 79 pound pitbull went to get her shot's 2 days ago and was acting funny so they took her back to this vet well he gave her medicine for the dog to feel better. well just today this dog has had hives,bloodystool,whitegums,bloodygums, and a temp of 104 they took her back to the vet today and he said it was hayfever.does anyone know what would cause this in a dog.the dog is home now but is still very weak and is still has bloody stool please help thank you.