The 40 Million Year Old Dog
Dogs and their ancestory dates back 40 million years to d the Miacis, a tree-climbing carnivore. An animal with five toes like a weasel it was a forebear of the cat, raccoon, bear, hyena, civet, and the dog.
Small or medium-size dogs usually live to be around 15 years of age, and large dogs live to be about ten years old. A fertile dog can produce about two litters a year with an average of six to ten puppies. Puppies grow in their mother’s womb until they are born, also known as whelped. They drink milk from their mother until they are weaned, at which point they are able to eat food. Weaning can be as early as three weeks, but puppies should not be weaned after week seven.
Pups get baby teeth, often called milk teeth, that are mostly incisors and canines sometime between week three and week six. By month three, the first