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It was about 1.5 meters (5 feet) long and weighed about 50 kilograms (110 pounds) on average. The dire wolf looked fairly similar to the modern gray wolf; however, there were several important differences. The dire wolf had a larger, broader head and shorter, more sturdy legs than its modern relative. The teeth of dire wolf much larger and more massive than those of the gray wolf. The braincase of the dire wolf is also smaller than that of a similarly-sized gray wolf. The fact that the lower part of the legs of the dire wolf are proportionally shorter than those of the gray wolf, indicates that the dire wolf was probably not a good a runner as the gray wolf.

Dire wolf - pups

Pups are born completely blind and deaf (but have a keen sense of smell), depending on the their mother and other members of the pack. The whole pack takes care and raises the pups (non-breeding females produce milk and males compete to baby sit).
Usually four to six pups are born together. This is called a litter, and the pups in a litter are called litter mates. Pups are born inside a den. A den is sometimes a small cave or a hole dug out of the ground
Stages of Development
10 - 13 days: the eyes open
3 weeks: the milk teeth appear, they start to explore the den
4 - 5 weeks: short trips outside the den, begin to eat meat
6 weeks: moving up to a mile from the den (with adult wolf)
6 - 8 weeks: pups are weaned, traveling to rendezvous site.
12 weeks: begin to travel with the pack on hunts (with adult wolves)
15 - 28 weeks: milk teeth are replaced
7 - 8 months: begin to hunt with the pack

pics