Why is my cat peeing outside of the letterbox? by Bash Halow | Mar 19, 2017 | 0 comments Cats that pee outside of the letterbox, unlike the one that we see here, may be sick, bullied by other cats, or merely protesting that the litter box is too full. Reach out to Brookfield to see how we can help. Submit a Comment Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Notify me of new posts by email.