This is mainly due to the famous Taco Bell television commercials in the late 1990’s. The breed has become extremely popular over the last few decades. It is often referred to as either “apple head” or “deer head,” describing their physical appearance. The Chihuahua is the smallest breed in the world. What do deer head Chihuahuas look like?.We’ll compare deer head vs apple head Chihuahuas, and help you to decide whether a tiny deer head Chihuahua puppy is the best pet for your lifestyle. Today we’ll look at what this head shape means for your new puppy. Testing for piebald spotting assists breeders with selection of matings that can produce the desired outcome for white.Deer Head Chihuahua dogs are a variation on the Chihuahua breed, with a longer muzzle and less rounded skull. In other breeds, piebald behaves as a recessive trait that is, 2 copies of piebald are needed to produce white spotting. However, additional mutations in MITF or other white-spotting genes appear to be present in these breeds that affect the amount of white being expressed. In Boxers and Bull Terriers, dogs with 2 copies of the MITF variant are completely white and dogs with 1 copy display the mantle (called "flash" in these breeds) pattern. A dog with one copy of the MITF variant has some white pattern expression, while a dog with 2 copies of the variant display more extreme white with color only on the head and perhaps a body spot. In breeds such as Collie, Great Dane, Italian Greyhound, Shetland Sheepdog, Boxer and Bull Terrier, piebald behaves as a dosage-dependent trait. The genetic determination of white spotting in dogs is complex. A DNA variant has been found in Microphthalmia Associated Transcription Factor- (MITF) gene that is associated with piebald spotting in many breeds. A pattern of less symmetrical white spotting, often called piebald, parti, or random white, is present in many breeds. The white pattern called mantle is phenotypically similar to Irish spotting but with more white extending onto the thigh and up the torso, as seen in some Great Danes. Some white patterns, such as the Irish spotting, are symmetrical with white markings on the undersides, collar and muzzle, and/or blaze such as seen in Boston Terriers and Corgis. White spotting patterns that occur in many dog breeds do not have a uniform genetic basis. White spotting on a Cavalier King Charles Spaniel Results of this test can be submitted to the OFA (Orthopedic Foundation for Animals) They will transmit this piebald variant to all of their offspring. White patterning may be extensive in some breeds, with some individuals being nearly completely white. Dogs with S/S genotype have two copies of this piebald variant and are expected to display some amount of white patterning.They may transmit this piebald variant to 50% of their offspring. They may display no white patterning or some amount of white patterning (varies by breed). Dogs with N/S genotype have one copy of this piebald variant.They cannot transmit this piebald variant to any of their offspring. Dogs with N/N genotype do not have any copies of this piebald variant and thus are not expected to display piebald patterning (though they may have other white markings caused by other genes). Mode of Inheritance: Incomplete dominance (some breeds), Autosomal recessive (some breeds)īreeds appropriate for testing: Many breeds including Basset Hound, Border Collie, Bulldog, Cavalier King Charles Spaniel, Chihuahua, Chinese Shar-Pei, Cocker Spaniel (American and English), French Bulldog, German Shepherd, German Pointer (Longhaired, Shorthaired, and Wirehaired), Havanese, Newfoundland, Poodle, Portuguese Water Dog, Saint Bernard, Yorkshire Terrier, Whippet The white markings are typically less symmetrical than those seen in dogs with the Irish spotting or mantle patterns. Phenotype: The extent of white pattern expression on the dog's body varies in piebald/parti/random white spotting. Piebald markings on a Newfoundland (also known as a Landseer Newfoundland)
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