I got my dog from a shelter about 4 days ago and he's had diarrhea ever since his 1st poop. He refuses to eat dog kibble (Blue Bison) and just recently his diarrhea looks to have a tint of red in it when he poops. Should I be wary of his poop or is it just red due to him having diarrhea for multiple days. Thanks! Also any advice on how to get my dog to eat?