Have in the past kept a can of plain pumpkin on hand for times needed (1--low calorie and 2--"firms what needs to be firmed and softens what needs to be softened") OF COURSE if it is ever needed a vet will be consulted first, but since my new store doesn't carry plain canned pumpkin, I took a look-see at what the baby aisle has (that's usually without spices and added sugars). They have yellow squash, but not pumpkin. Is it a substitute?