A cat that hasn’t pooped in three days but is in good spirits may be constipated due to indigestion or lack of exercise. You can try to adjust the cat’s diet. It is best to switch to liquid food that is easier to digest, such as warm water or goat milk. Soak cat food with milk powder, fish soup, meat porridge and other foods. You can also add some probiotics to the food to help the cat regulate its gastrointestinal tract and promote digestion. The cat should exercise more and play more to promote metabolism and facilitate the cat's defecation. If it still does not poop, it is best to take the cat to the pet hospital for examination and confirmation. Whether constipation is caused by disease.