Why are my littermate cats peeing outside the box and acting strange?

Question

I have 2 litter mate cats. 1 Male, 1 female. Recently one of them has been pooping outside of the litter box. I got them larger litter boxes and clean litter. The poop is not consistent. 2 days in a row then a week with no poop etc. No blood or worms seen. Today one of the cats started digging in a plant I have in the house. They have never done that. After I cleaned it up and moved the plant a cat peed in the area. My female cat has been growling and agitated lately tooNo change in diet lately. Pet's info: Cat | American Shorthair | Male | neutered | 3 years old

Sabina Snyder, Specialty Surgery Technician · Accepted Answer

It sounds like you have a few issues going on. First, I would ask if they are spayed and neutered? Cats start to come into heat anywhere from 6 months old and up. Their heat cycle repeats every three weeks. This could be why your female cat is acting strange. Male cats will start to develop testosterone which will cause them to do silly things... like pee in places to mark their territory. And yes, sibling cats will mate. They don't know or care that they are siblings. So it is best to have them both fixed. The second most common reason cats will urinate or defecate outside the box is an illness. Many have urinary tract infections or crystals in their bladders that cause a lot of discomfort. I would definitely have a vet check them out to rule out health issues. Finally, you should always have one more littler box than you have cats. So for you, I would say have three boxes, spread throughout the house. Cats can become territorial about boxes and will chase another cat out of "their box." I hope this helps! Thank You for choosing Petco Pet Education Center, formerly Petcoach. If you have any further questions or concerns, please feel free to ask for a consultation!

Why are my littermate cats peeing outside the box and acting strange?

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