The texture may be slightly drier than canned pumpkin, so you may need to add an additional tablespoon or two of water to the dough. Sweet potato or butternut squash can be swapped for pumpkin.Those little packets are not good for your dog.
You can swap out quick cooking oats for regular old fashioned oats. Wait 5 minutes until it has started to gel before adding to dough. To make these dog biscuits without eggs, substitute with 2 tbsp.
You cannot use steel-cut oats, as those are entirely different. I use old-fashioned oats, but you can use a quick cooking variety if that’s what you have.