The breasts of the dogs can be observed, if there is sufficient milk, the breasts will be larger and can be squeezed with their hands, while those of the dogs with insufficient milk will be dry, with little or no milk. It is also possible to observe dogs, who, if they have enough milk, will be fed more and will not bark, because every puppy will be fully fed and will sleep.
From the looks of it, there's always a downsliding of milked cow nipples, and we can observe when the dog comes out, and if its abdomen are flat enough, it's not enough milk. If it's downhill, it means there's enough milk. The chronically hungry dog-baby will scream and suffer from weakness and not smooth fur.
So when the dog baby screams, it can judge whether the cow's milk is adequate. When the dog's milk is full, it gets swollen, and it waits for the baby to drink milk. The fact that the dog is not willing to stay in the house for long periods of time indicates that it has insufficient milk.
The master can observe the dog more often and care more about it. Last one. Next one.