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.
Stage 1 labor has not progressed to Stage 2 labor after 24 hours; The first puppy has not been delivered after 1 hour of active labor; It has been more than two hours without another puppy arriving. (It is normal for dogs to occasionally take a break from labor between pups, but that resting period tends to last just an hour or two.)