Preheat the oven to 350 degrees . Lightly grease an 9-inch square baking dish.
In a food processor, combine the tuna with its liquid and the eggs; pulse to blend. Add the flour and pulse until crumbly.
Transfer the mixture to a baking dish and press into an even layer. Bake until set, about 5 minutes. Let cool for 15 minutes, then cut into 3 dozen squares. Once the treats cool completely, store in an airtight container in the refrigerator for up to 1 week, or freeze for up to 3 months.