Plain 100% pumpkin is safe for cats and can be useful for treating gastrointestinal issues.
It contains healthy ingredients such as potassium, phosphorous, calcium, vitamins A, C, and K, and lots of fiber.
Risks
Pumpkin pie and canned pumpkin pie filling contain spices like cinnamon, nutmeg, ginger, and allspice, which can be mildly toxic and result in gastrointestinal upset.
Pumpkin seeds can become a choking hazard and may cause intestinal obstruction if consumed in large quantities.
Suggestions
Feed your cat a small amount of cooked, plain pumpkin with no spices added.
Canned or pureed pumpkin is also safe as long as no other ingredients have been added.
Avoid pumpkin pie filling and monitor your cat for any signs of gastrointestinal distress.
Note: even if labeled as safe, any food can potentially cause allergies. When introducing a new food, please feed a small amount and observe your cat for any allergic reactions.