I know exactly what you mean, I know jinx just doesnt want to go outside like she would in the summer. Now we have 6 inches of snow and she wont go out, but that doesnt exuse her from the litter box, im sorry. put her in the crate and she is sleeping in the litter box, tearing up the newspaper. but the urine thing might be a good idea to rule anything out. take a sample with you.