Normally my rabbit eats a mix of 70% science selective and 30% fibre first. I ran out of science selective last night, only fed the fibre first because I was lazy opening a new bag of science selective, and also forgot to top up her hay. In the morning I fed the science selective which she dived into but I again forgot to top up her hay until midday. She spent the remainder of the day laying on the litter tray, and a few times it looked like she was constipating and trying to poop. I tried giving her meadow hay and timothy hay and spinach, all of which she refused and just looked like a constipated rabbit.
I went out about an hour ago, bought some mint, she ate a bit and the mint seemed to trigger her appetite and she ate a large handful of timothy and meadow hay, and I finally saw her poop! I read the strong aroma from mint improves appetite, and also bowel movement. It really works!