From 8-year old Hilda’s diary:

Some of my Uncle Milton’s friends were here for dinner tonight and I begged Grandmother to let me be allowed to come to the table because I love to hear all those things they say about dogs. They talked only about dogs. I learned lots of things. It is very important what father and mother a dog has. When a puppy is born they always describe it as being born by someone out of someone else. “By someone” means the father and “out of someone” means the mother. I asked them if my baby cousin Helen Violet was by my Uncle Albert and out of my Aunt Hazel and they all laughed.