Puppy development is almost complete around day 58, which means the puppies will begin to move into whelping position in the birth canal over the last few days of the bitch’s pregnancy. Symptoms during the last few days of pregnancy in dogs: 1  Waist will trim as puppies move into the birth canal. 2  Appetite loss around day 61 or 62. 3  Drop in body temperature 12-to-24 hours before labor. 4  Restless behavior. 5  Pacing, panting, shivering, or digging.