Can I Give My Dog generic 100% pumpkin?

No
Plain pumpkin, never pie filling (spices, sometimes xylitol).
Source: Veterinary Partner (VIN)
Already ingested? Pet Poison Helpline 855-764-7661

Skip it or ask a vet first if

pumpkin pie filling

The safe habit

Confirm any medication decision with your veterinarian, who knows your dog's health history and other medications. VetDose shows published reference data, not prescriptions.