My friend's dog has had a bad tummy for almost a week now. Started off with diarrhoea that had mucous and blood. The vet put it down to worms, wormed the dog. The dog recovered completely within 12 hours, and we thought no more of it. However, the dog vomited yesterday, and had bloody muscousy diarrhoea again today. The vet has now said the dog has picked up some germ from the dog park and is on antibiotics. I was just wondering about the other possible causes there are for passing mucous and blood in stools.