Things You'll Need
Combine pumpkin, cinnamon and egg in the bowl of a stand mixer, or a large bowl if you are mixing by hand. Mix until blended.
Add flour 1/2 cup at a time into the bowl until stiff dough forms.
Roll the dough out onto a lightly floured surface to about 1/2 inch thick.
Use small cookie cutters to cut the dough into bite sized treats.
Line dog treats 1/2 inch apart on a non-greased cookie sheet. These treats won't expand so you don't have to worry about them being so close together.
Bake for 25-30 minutes or until treats are golden brown. Turn the oven off and leave the treats in the oven for 1-2 hours to allow them to become crunchy. Then remove from the oven and let cool.
Store treats at room temperature in an air tight container for up to 2 weeks, or store in the fridge for up to a month.