Glad my dog poops outside. Its only a little nasty on the policing of the sidewalk gift.
Yes, the occasional accident happens. Its not a regular occurrence unless the temperature is -10F or below, then walks are suspended.
In college we had a housemate who had a cat. My bedroom was in the basement. The litter box was in the open area of the basement. One day i noticed the aroma was particularly strong. I asked the owner to please attend the litter box. She grumped at me. 3 days later, the stench was overwhelming. I looked at the box, it was a liquid/solid/clay soup with floaties. Nearly tossed my cookies. I carefully picked up the box, carried it to the house mate's room, set it on the floor, made sure the cat was in the room and closed the door. The hint was received.