Hello, I am fostering a mother and her 3 pups. Being that she is a rescue we do not know what breed the mate was but by the size of the pups assuming medium breed. Mother is small. Pups are gaining between 11-13% of their birth weight daily. Mom seems to be going to pups less often. Tried bottle feeding and mixing food with formula and pups are not interested. Any recommendations? Just want to make sure they are getting all they need as mom may be too small to produce enough. Teeth are starting to come in.