An appendage growing from the stem of a plant. Leaves are extremely variable in form and function according to species. For example, the needles of pine trees, the spines of cacti, and the bright red parts of the poinsettia plant are all leaves modified for different purposes.
Take her temperature daily as her expected delivery date approaches. Normally a dog's temperature is between 101 and 102 degrees. When your pregnant dog's temperature drops below 100 degrees, that's an indication she'll have her puppies within 24 hours. Once labor begins, it can last up to 12 hours. If your dog's temperature drops significantly, she's ready to give birth soon.
Dogs, like people, have a first stage labor where the body prepares to give birth. This includes weak uterine contractions which cause discomfort, panting, and general restlessness. In some dogs this can last for 24 hours before the dog feels the needs to push the puppies out, so six hours can be normal.