Our Siamese male, 10 yo, has been peeing all over the house...the standing up thing. He hates it when the litter box is even slightly dirty, and he will refuse to use it. So, he pees on the furniture, the drapes, the walls, whatever!! I have to remember to clean the box every morning and night. And I have a female manx that has constipation problems because of her anatomy (tail is top of anal canal), and drops turds all over the house. Luckily mostly dry.
What we put up with for our animals!!! WOW!! Worse than kids.