Question: What type of genes does the Australian Stumpy Tail Cattle Dog have with respect to its tail?

full_context: Document 1: Australian Silky Terrier: The Australian Silky Terrier is a small breed of dog of the terrier dog type. The breed was developed in Australia, although the ancestral types and breeds were from Great Britain. It is closely related to the Australian Terrier and the Yorkshire Terrier. The breed is called the "Silky Terrier" in North America, but is called the "Australian Silky Terrier" in its country of origin and in the rest of the world.
Document 2: Interbreeding of dingoes with other domestic dogs: The interbreeding of dingoes with other domestic dogs is an ongoing process affecting the population of free ranging domestic dogs in Australia. The current population of free ranging domestic dogs in Australia is now probably higher than in the past. However, the proportion of the so-called "pure" dingoes (dogs with exclusively dingo-ancestry) has been in the decrease over the last few decades and is regarded as further decreasing.
Document 3: Dingo (taxon): The taxon dingo refers to the native dog found in Australia but may at times also refer to some similar dogs native to peninsular and island southeast Asia and neighboring regions, such as the New Guinea singing dog. The genetic evidence indicates that the "dingo" clade originated from East Asian domestic dogs and was introduced through the Southeast Asian archipelago into Australia, with a common ancestry between the Australian dingo and the New Guinea singing dog.
Document 4: Natural bobtail: A natural bobtail is an animal's tail which due to a mutated gene grows unusually short or is missing completely. The genes for the shortened tail may be dominant or recessive.
Document 5: Pug: The Pug is a breed of dog with physically distinctive features of a wrinkly, short-muzzled face, and curled tail. The breed has a fine, glossy coat that comes in a variety of colours, most often fawn or black, and a compact square body with well-developed muscles.
Document 6: Australian Stumpy Tail Cattle Dog: The Australian Stumpy Tail Cattle Dog is a naturally bobtailed or tailless, medium-sized breed of Cattle Dog (not to be confused with the Australian Cattle Dog, aka "Queensland Heeler"). The Australian Stumpy Tail Cattle Dog was developed in Australia to herd cattle, and descends from crosses between European herding dogs and the Australian dingo. The name is spelled both with hyphenation, as Australian Stumpy-Tail Cattle Dog, and without, and the shorter name Stump Tail Cattle Dog is also sometimes applied.
Document 7: American Bobtail: The American Bobtail is an uncommon breed of domestic cat which was developed in the late 1960s. It is most notable for its stubby "bobbed" tail about one-third to one-half the length of a normal cat's tail. This is the result of a cat body type genetic mutation affecting the tail development, similar to that of a Manx cat. The breed is not related to the Japanese Bobtail despite the similar name and physical type—the breeding programs are entirely unrelated, and the genetic mutation causing the bobbed tail are known to be different because the mutation causing the American Bobtail's tail is dominant, whereas the Japanese Bobtail tail mutation is recessive.
Document 8: Pit bull: Pit bull is the common name for a type of dog. Formal breeds often considered in North America to be of the pit bull type include the American Pit Bull Terrier, American Staffordshire Terrier, American Bully, and Staffordshire Bull Terrier. The American Bulldog is also sometimes included. Many of these breeds were originally developed as fighting dogs from cross breeding bull-baiting dogs (used to hold the faces and heads of larger animals such as bulls) and terriers. After the use of dogs in blood sports was banned, such dogs were used as catch dogs in the United States for semi-wild cattle and hogs, to hunt and drive livestock, and as family companions. Despite dog fighting now being illegal in the United States, it still exists as an underground activity, and pit bulls are a common breed of choice.
Document 9: Domestic short-haired cat: A domestic short-haired cat is a cat of mixed ancestry – thus not belonging to any particular recognized cat breed – possessing a coat of short fur. In British English, they are often referred to as moggies. Domestic short-haired cats should not be confused with the British Shorthair, American Shorthair or other standardized breeds with "Shorthair" names, which are breeds recognized by various registries. Domestic short-haireds are the most common cat in the United States, accounting for around 90–95% of their number. Other generic terms include house cat and alley cat (the latter may be used more specifically to refer to feral specimens). The term tabby cat technically refers to a coat pattern, but is also often used as a general term for cats of this sort.
Document 10: Complex vertebral malformation: Complex vertebral malformation or CVM is a lethal hereditary syndrome found in Holstein cattle. CVM is responsible for malformed calves that are either spontaneously aborted or die shortly after birth. It is caused by a missense mutation in the SLC35A3 gene. Since the mutant form of the gene is recessive, only individuals carrying two copies of the faulty gene (homozygous individuals) are affected. Heterozygous individuals, those who carry one copy of the faulty gene and one copy of the normal gene, have no symptoms but may still pass the disease on to their offspring.
Document 11: Skinny pig: The Skinny Pig is an almost hairless breed of Guinea pig. Skinny pigs typically have hair on their muzzles, feet, and legs, but are hairless over the remainder of their bodies. Some of them have a thin covering of fuzzy hair on their backs as well. A healthy Skinny has skin that is mostly smooth with some wrinkling around the legs and neck, the body is full with no appearance of spine or ribs. Skinnies can come in a variety of colours and patterns, such as Dutch, Tortoiseshell, Himalayan and many others. "Skinny" is the term used for hairless guinea pigs to describe the illusion of their visually thinner appearance, or coloquially referring to the exposed skin of the animal. The modern Skinny Pig breed originated with a cross between haired guinea pigs and a hairless lab strain. The hairless strain that it is most likely related to was a spontaneous genetic mutation that was first identified at Montreal's Institute Armand Frappier in 1978, in a colony of Hartley lab guinea pigs. In 1982 they were sent to Charles River Laboratories to be bred for laboratory use and are commonly used in dermatology studies today. They are an outbred strain that has an intact thymus and normal immune system.
Document 12: Koolie: The Koolie (also known as the Australian Koolie or by the misnomer German Coolie) is an Australian dog breed. The Koolie is a working or herding dog which has existed in Australia since the early 19th century when it was bred from imported British working dogs. Robert Kaleski, in an article on Cattle Dogs in the August 1903 issue of the Agricultural Gazette of New South Wales, describes the "Welsh heeler or merle, erroneously known as the German collie," as a "blue-gray dog about the size and build of a smooth-haired collie, generally with wall eyes." The British background predominated in the dogs that came to be associated with the "German collie" name.
Document 13: Halls Heeler: The Halls Heeler was a dog bred by Thomas Simpson Hall to herd cattle on the Hall family's extensive properties in north-western New South Wales in the 19th century. On "Dartbrook Station", in the Upper Hunter Valley, Hall selectively crossed the offspring of Northumberland Drover's Dogs (Border Collie lineage) that he had imported, with progeny of dingoes that he had tamed. By 1840 he had bred the type of dog that he needed to control cattle on the massive runs that his family owned, and until he died in 1870 few of these dogs were owned and used by anyone outside the Hall family and their workers. However the death of Thomas Hall and the break-up of the Hall estate coincided with the development of the dog show, and an interest in breeding dogs to specific criteria or standards. The Halls Heeler was further developed into two contemporary dog breeds the Australian Cattle Dog and the Australian Stumpy Tail Cattle Dog. The name is spelled both with the possessive apostrophe, as Hall's Heeler, and without.
Document 14: American Ringtail: The American Ringtail Cat is a new experimental cat breed that started with a California cat named Solomon in 1998. Owner Susan Manley started a breeding program to reproduce his unique curled tail, which she had also noted in other feral cats in northern California. This genetic mutation seems to have no ill health effects associated with it. The cats with curled tails were bred with Ragdoll cats and American Shorthair cats. In 2005 The International Cat Association, gave this new breed “Registration Only” status.
Document 15: Australian Cattle Dog: The Australian Cattle Dog (ACD), or simply Cattle Dog, is a breed of herding dog originally developed in Australia for droving cattle over long distances across rough terrain. This breed is a medium-sized, short-coated dog that occurs in two main colour forms. It has either brown or black hair distributed fairly evenly through a white coat, which gives the appearance of a "red" or "blue" dog. It should not be confused with the Australian Shepherd, a similarly named but totally different breed.
ground_truth: dominant or recessive.