(malocclusions), hip dysplasia, elbow dysplasia, and subluxating patella, as these are problems that appear in the related Rat Terrier. Ectopia lentis, a congenital condition, also affects this breed. Although not currently well-documented in the Teddy Roosevelt Terrier, it is seen in small numbers and populations according to the Orthopedic Foundation for Animals, but is still seen in higher numbers in the Rat Terrier and other terrier breeds. References Further reading * Bishop, Joseph Bucklin, ed. Theodore Roosevelt's Letters to His Children. New York: Charles Scribner's Sons, 1919. Letters from 1898–1911. Kane, Alice J. (2004). Rat Terrier: a Comprehensive Owner's Guide (Special Limited Edition). Kennel Club Books . Rat Terrier Club of America. "What is Their Temperament Like?". Retrieved August 30, 2007. Orthopedic Foundation for Animals Teddy Roosevelt Terrier Primary Lens Luxation Test Results. Retrieved September 12, 2012. External links History of the Teddy Roosevelt Terrier United Teddy Roosevelt Terrier Club of America American Teddy Roosevelt Terrier Club The Bench Legged Fyce Companion dogs Dog breeds originating in the United States Hunting dogs Rare dog breeds Terriers