40天小狗一天吃多少狗粮

It depends on the size, age, and activity level of the dog, as well as the specific brand and type of dog food. Typically, a small to medium-sized adult dog needs about 1-2 cups of food per day, while a large dog may need 2-3 cups. It's best to consult with a veterinarian or follow the feeding guidelines on the dog food packaging for specific recommendations for your dog.