I just noticed bright red blood on my cat's anus. I haven't been able to locate any of his feces in the little box.
* Does anyone have any idea what may be causing this?
* How serious is this concern -- enough that I should visit the vet?
Our cat, Azreal is a neutered domestic long hair that is about 4 years in age. He is acting normal -- except maybe for increased meowing during the evening.
Any help is greatly appreciated.