When Timothy wanted to go outside (for a wee) he’d just patiently wait by the back door, or sometimes the front door. If we hadn’t noticed that he was waiting, or we were watching TV and asked him to wait, he’d determine that his chosen door wasn’t “working” and would go to the other door. By being good and not making a fuss, by the second time he’d change from one door to the other, we’d feel bad and let him out straight away.
If he URGENTLY needed to go out, it was always to the back garden, and usually because he wanted to eat some leaves. Only particular leaves would do, and he’d eat them until he felt that was enough: usually then being sick.
The leaves couldn’t be too big or old, even from his chosen plants. If it was raining or cold, I’d bring in a branch or two of approved leaves and put them under the foot of the sofa – he always appreciated that and rarely snubbed them.
If he was actually sick, he always tried to get outside, or as close to the door as possible.