40只柴犬一次吃多少狗粮

It would depend on the size and activity level of the individual dogs as well as the quality of the dog food. Generally, a healthy adult chihuahua will eat around 1/4 to 1/2 cup of dry dog food per day. So for 40 chihuahuas, that would be 10 to 20 cups of dry dog food per day. However, it is recommended to consult with a veterinarian or a professional dog nutritionist for accurate feeding recommendations for your specific group of dogs.