Many dogs will not pass faeces for the first four to five days after surgery.
Reasons include, but are not limited to:
- The dog has been fasted prior to surgery.
- Dogs do not eat well during the hospital stay.
- They frequently do not eat well when they go home, as they are still recovering fully from anaesthesia.
- They are fed highly digestible recovery food that produces little faeces.
- Analgesia that contains narcotics (such as morphine, fentanyl patches and tramadol) can cause constipation.
Most dogs respond well to laxatives, such as lactulose, or a little vegetable oil in their food.