I have two male cats, ones name is Claudius and the other Hamlet. They are 6mo. indoor cats, they are brothers that I adopted from the SPCA 4 months ago with all of their shots, they were neutered as well. Within the last week or so Claudius hasn't been as active as usual and sleeping a lot more, also eating less. About 2 to 3 weeks ago I decided to start toilet training them, it's working out very well for Claudius and not so well for Hamlet. Well, I went to check on Claudius a couple of days ago to see if he was being a good boy and give him a treat for doing his business in the toilet and noticed that there was blood in the toilet mixed with mucus and diarrhea. It had me worried but I decided to wait a couple of day to see if it happened again and it did. I've knocked out the possibility of worms and Claudius eating something that he shouldn't have like plants and what not. I'm going to call the vet tomorrow regardless of anyones advice but I always like others opinions.