Yes, when cooked and served in moderation. Acorn squash is a good source of dietary fiber, vitamins A and C, protein, and carbohydrates. Serving dogs a half cup or 103 g of cooked acorn squash can be beneficial for their health. It’s important to note that the squash should be plain with no added ingredients, such as sugar or spices. These extras can cause stomach upset for your pup. Yes, dogs can eat acorn squash. Acorn squash contains 5g of dietary fiber, 15g of total carbohydrates, and 1g of protein per every 103 grams cooked. It also has important vitamins such as vitamins A and C that are beneficial for the health of your furry friend.