If the mother does not have much milk, then you should continue to tube feed them; the pups are probably getting the nutrition from you tube feeding them and if you stop tube feeding them then things would go worse. As for the gaining, I am not sure if there is a set weight gain that they should achieve, but I was always told that they should gain a little each day and should not lose any weight.
Sorry I can't be more help. Good Luck with the puppies!! |