A canine pregnancy lasts just 63 days, so there’s a great deal to expect within a short period of time. Behavior changes in the future mother usually begin as soon as she feels her pregnancy, but the biggest changes are evident after 45 days. The mammary glands will continue enlarging towards full capacity at about five days before she gives birth, with the presence of milk starting around two weeks before delivery. Puppy food is recommended for pregnant females, as well as vitamins and minerals, to make her strong and healthy.

The Howler Magazine