Normal dogs have always originated from wolves. Their snouts grow shorter and their bodies stockier and not built to kill and hunt.
However, Wolf Dogs is a canid hybrid resulting from the mating of a gray wolf (various Canis lupus subspecies) and a dog (Canis lupus familiaris).
Wolf dog legislation in breed
The wolf dog hybrid has been the center of controversy for much of its history, and most breed-specific legislation is either the result of the animal's perceived danger or its categorization as protected native wildlife. The Humane Society of the United States, the RSPCA, Ottawa Humane Society, the Dogs Trust and the Wolf Specialist Group of the IUCN Species Survival Commission consider wolf dogs to be wild animals and therefore unsuitable as pets, and support an international ban on the private possession, breeding, and sale of wolfdogs.
According to the National Wolfdog Alliance, 40 U.S. states effectively forbid the ownership, breeding, and importation of wolfdogs, while others impose some form of regulation upon ownership. In Canada, the provinces of Alberta, Manitoba, Newfoundland, and Prince Edward Island prohibit wolf dogs as pets. Most European nations either outlaw the animal entirely or put restrictions on ownership. Wolf dogs were among the breeds banned from the U.S. Marine Corps base at Camp Pendleton and elsewhere after a fatal dog attack by a pit bull on a child.
Description
Wolf dogs tend to have somewhat smaller heads than pure wolves, with larger, pointier ears that lack the dense fur commonly seen in those of wolves. Fur markings also tend to be very distinctive and not well blended. Black coloured hybrids tend to retain black pigment longer as they age, compared to black wolves. In some cases, the presence of dewclaws on the hind feet is considered a useful, but not absolute indicator of dog gene contamination in wild wolves. Dewclaws are the vestigial first toes, which are common on the hind legs of domestic dogs but thought absent from pure wolves, which only have four hind toes. Observations on wild wolf hybrids in the former Soviet Union indicate that wolf hybrids in a wild state may form larger packs than pure wolves, and have greater endurance when chasing prey. High wolf-content hybrids typically have longer canine teeth than dogs of comparable size, with some officers in the South African Defence Force commenting that the animals are capable of biting through the toughest padding "like a knife through butter". Their sense of smell apparently rivals that of most established scenthounds. Tests undertaken in the Perm Institute of Interior Forces in Russia demonstrated that high wolf-content hybrids took 15–20 seconds to track down a target in training sessions, whereas ordinary police dogs took 3–4 minutes.
Info taken from:http://en.wikipedia.org/wiki/Wolfdog
Aggression
Wolf Dogs generally have a good temperament, however, they have the hunting instincts of a wolf. When they see someone flailing their arms about, they see this as an animal struggling and would bite the person's ankle like what a wolf will do, so that their prey will fall and they can go in for the kill as his or her neck would have been exposed. Thus, it is unwise to keep a wolf dog when there are young children around as children tend to wave their arms around when playing.
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