Bentley has had soft stools today and it's gotten worse where it's pretty loose. Late this afternoon I noticed that it has blood in it and he acts like he's not feeling well. I'm due to leave out of town in the morning and called my vet 30 minutes before they left the office for the day. I explained what was going on with him and they didn't have an opening and 2 of the vets had already left for the day. The remaining vet told me to come on in and get some antibiotics to start him on. But I'm very worried. What would cause him to have bloody stool? He's almost 4 years old. Any ideas? Will he be ok????