BEHAVIOR | SICKNESS
Here are some of the reasons why rabbits stop pooping.
Your bun needs plenty of fiber in his diet for his digestive system to function properly.
Rabbits need to chew constantly. Otherwise, their perpetually-growing teeth get too long and cause some problems.
Low Levels of Vitamin C
While your bun won’t usually need vitamin C supplements, low levels of this vitamin can also cause pooping problems.
Water is life. That holds true for almost all creatures, including humans and rabbits. If your pet doesn’t get enough water, this can affect food movement through his intestinal tract.