Gut stasis is something we always dread at the rescue but it unfortunately sometimes happens. Stress, other underlying health problems or a poor diet often contributes to a slowdown in the digestion which, in turn, can lead to ileus (a complete standstill).
The important thing is to get treatment as soon as possible. When a rabbit goes into ileus it can quickly become an emergency.
Signs to look out for: a reduced faecal output, smaller than normal size of faeces, a hunched posture, bloating of the stomach, grinding of teeth, changes in gut noises.
At the rescue we often need to use an aggressive treatment of Ranitidine, Metoclopramide, Metacam and, if necessary, syringe feeding of Critical Care. Please take advice from your vet. We have found it often helps to put the bunny on a warm heat pad, give their stomach a gentle massage and to keep them moving.