Poor Fenway! I'm glad he's better now though!

Miss Meow, I hope both of your sausages are fine. Keep an eye on the stools, and if you see blood in it again, take a sample of it to your vet. There could be a number of different things that can cause that, like KYS mentioned: irritation of the stomach/colon/upper digestive tract, blockage etc. etc. Could also be an infection. Is there any standing water near where you live? Giardia live in that sort of environment, and dogs can pick it up easily. It can sometimes cause bloody diarrhea and/or simply loose stools.

Let us know how your babies are doing!
**hugs**
Karen