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The Rat Terrier is an American dog breed with a background as a farm dog and hunting companion. [1] They share much ancestry with the small hunting dogs known as feists . Common throughout family farms in the 1920s and 1930s, they are now recognized by the United (UKC) and American Kennel Clubs (AKC) and are considered a rare breed. [ 2 ]
The Pražský Krysařík is a small toy dog, similar in appearance to the Chihuahua and the Miniature Pinscher, with a height of 20 to 23 centimetres (7.9 to 9.1 in) and a weight of 1.5 to 3.5 kilograms (3.3 to 7.7 lb).
In 2020, the sequencing of ancient dog genome indicates that in two Mexican breeds the Chihuahua and Xoloitzcuintli derive 4% and 3% of their ancestry from pre-colonial dogs, [10] almost entirely being descended from Eurasian dogs. Their phenotype is a consequence of canine ectodermal dysplasia caused by a mutation on the FOXI3 autosomal gene. [11]
The feist is not a new type of dog. Written accounts of the dogs go back centuries, with several spelling variations seen. George Washington referred to them in his diary in 1770 when describing a dog as "a small foist-looking yellow cur". [1] Abraham Lincoln wrote about the "fice" dog in his poem, "The Bear Hunt".
The Russian Toy was originally bred as a rat fighter and watchdog, and can still exhibit the vocalization expected from the latter. It is a friendly dog and can become very attached to the family unit. Due to its size and similarities to the Chihuahua, the two are often compared, but are not closely related.
A 2018 study in Japan of pet cemetery data found the Chihuahua to have an average life expectancy of 11.8 years compared to 15.1 for crossbreeds and 13.7 overall. [26] A 2022 UK study on life expectancy of dog breeds based on veterinary data showed the average life expectancy to be 7.91 for the breed compared to 11.82 years for crossbreeds.
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[1] [2] Named Josephine, the bitch conformed to the Rat Terrier type in every way except for her coat, so the Scotts bred her. Her first litter produced another hairless bitch pup, Gypsy. [1] [2] Neither bitch whelped another hairless pup in multiple litters until, in 1981 at the age of nine, Josephine produced two more hairless pups, a dog and ...