A medium-sized predator: growth at a shoulder is up to 50 cm, length of body is up to 80 cm, weight is up to 25 kg. By proportions it reminds of a stumpy dog. the Head is pointed, the face department of a skull is extended, jaws are strong. Top canines slightly jut out of the closed mouth. Molars have acute tops of "carnivorous" type. The origin of this animal is showing by character of wool in which there are sharp spikes protecting an animal from enemies: this species descends from the modern hedgehog (Erinaceus europaeus). The wool on sides and stomach, and also on muzzle has no spikes. Spikes on the head, neck and shoulders are especially numerous. On the back there are not so much spikes, waist is practically spineless. Animal prefers to defend from enemies actively, biting and striking impacts by prickly head.
The Spinywolf has good immunity to the poisons, inherited from an ancestor. It eats practically any animal food: invertebrates (including poisonous ones), small vertebrates, sometimes beast attacks young growth of large herbivores. As a rule, it hunts solitary, only the female and its pack keep by group. Breeding season lasts at an autumn. Courtship is reduced to fight of males for the female and to fast pairing. Animal does not fall into hibernation, only in keen frosts activity is reduced, this time the beast spends in shelter: the lair or the hole. Hairless and blind cubs (3 - 7) are born at the end of winter. In some hours after birth they start to become covered by spikes and wool. At the age of 3 days spikes already become firm. At the age of week eyes open. Month-aged cubs creep in shelter, in 3 months they leave it for games. 5-month-aged cubs hunt together with mother, remaining at it up to an autumn. Sexual mature is at the age of 18 months, animal lives up to 13 - 15 years.