This mutation is fixed in some breeds, such as the Irish Water Dog, and is variant in other breeds, such as the Kuvasz. The Hair Curl mutation can also be accompanied by the other mutations that can change coat length and type. For example, the Airedale Terrier has both the curly coat, as well as furnishings that are responsible for the eyelashes and mustache. Other breeds, such as the Standard Poodle, can have all three mutations, creating a long-haired curly coat with furnishings.
Because the Hair Curl gene is dominant, a dog only needs to have one copy of the gene to express that phenotype. This means that a dog can carry the allele responsible for non-curly hair, and could pass that on to any offspring. If two dogs that are both carriers of the non-curl gene are bred, there is a 25% chance that each parent could pass on the non-curl gene to each puppy, resulting in a dog with non-curly hair
Dogs can be DNA tested at ANY age
Airedale Terrier, American Water Spaniel, Bichon Frise, Border Collie, Boykin Spaniel, Chesapeake Bay Retriever, Chihuahua, Dachshund, Havanese, Kerry Blue Terrier, Kuvasz, Leonberger, Maltese, Pharaoh Hound, Portuguese Water Dog, Soft Coated Wheaten Terrier, Welsh Terrier, Wire Fox Terrier.
|C/C||Curly Hair||The dog has two copies of the hair curl allele. The dog will have curly hair, and will always pass on a copy of the hair curl allele to any offspring. All offspring of this dog will have curly hair..|
|C/c||Curly Hair||Both the dominant and recessive alleles detected. The dog will have curly hair, and carries the gene responsible for non-curly hair. The dog can pass on a copy of either allele to any offspring.|
|c/c||Non-Curly Hair||The dog is negative for the hair curl allele. The dog will have non-curly hair, and will always pass on the allele responsible for non-curly har to any offspring.|