Signs before a dog gives birth include a drop in body temperature, changes in appetite, swollen mammary glands, loss of amniotic fluid, etc.

Body temperature drop: About 24 hours before delivery, the dog's body temperature will drop to about 36.5°C. This is a big sign that your dog may be giving birth soon.

Appetite changes: Before delivery, your dog’s appetite may decrease or disappear entirely. This is because the dog’s abdominal space is limited and cannot accommodate more food.

Swollen mammary glands: Before giving birth, the dog's mammary glands will become swollen and filled with milk. This is preparation for providing adequate food for newborn puppies.

Loss of amniotic fluid: Before giving birth, dogs may lose amniotic fluid, which is part of the fluid in the uterus. Loss of amniotic fluid is a sure sign that labor is about to begin.

Uterine contractions: Before giving birth, your dog may experience significant contractions in her abdomen. This is the uterus preparing for birth, pushing the puppy outward.