The long throw of the change, particularly side - to - side, and a lack of physical obstruction for reverse, means it's far too easy to make this mistake. (evo.co.uk)
Physical obstructions in the gut, like scarring from surgeries or Crohn's disease, can also cause an abnormal buildup of bacteria in the small intestine. (mindbodygreen.com)
Other factors include the age and condition of the animal, or injuries or physical obstructions caused by deformed or oversized eggs, physical abnormalities with the reproductive tract or pelvis, infections, constipation, abscesses or masses. (brittonroadveterinaryclinic.com)