Thanks for all the information eveyone. I am really fussy about what I feed my puppies, my partner thinks they eat better than we do. I don't buy anything with preservatives and they have a little dry food with mostly fresh cooked food. I do admit tho' I don't cook it myself - I buy it. On Sunday before we had this episode with bloody poo Penny had had quite a few training treats and one of those compressed bone things - would rich foods like this exacerbate something like colitis?