Not to sound crude...but many times the rectal area will have a burnt orange/red fecal fluid crust. Especially if you are feeding something that is colored, like meowmix. You can use a wet wipe and clean the area and see how blood like it appears.
Fresh blood can come from straining or even passing the undigested hair from grooming. I would watch and try to determine if it truly is blood.
Dr.V
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Dr. D.A. Vamvakias
Veterinarian
