The phrase "nursing females" refers to female animals who are taking care of their newborn babies and providing them with milk to drink. Full definition
Unlike most puppy foods, it is NOT recommended for pregnant or nursing female dogs. (dogfoodinsider.com)
They have been tested and found to be completely safe for use in pregnant and nursing female dogs, as well as those suffering from illness. (mypetneedsthat.com)
Pregnant and nursing females store fat to assure successful lactation. (modernmom.com)