My cat didn't poo for 3 days so I had decided to call the vet if she didn't poo by the 4th. But she made a little one so she wasn't all stopped up. Today, two days later there's a big poo in the litter box. I have been giving her more wet food so she doesn't have to eat the dry food left out. I think it is because we turned the heat on and she hasn't adjusted by drinking more.