Descriptions of Diseases and Traits for which the University of Missouri Canine Genetics Laboratory Offers DNA Testing (Listed by disease name) Adult-onset Neuropathy (AON) Disease description: Adult-onset neuropathy (AON) of English Cocker Spaniels and Field Spaniels is characterized by progressive weakness due to a neuropathy. Signs typically begin between 7.5 and 9 years of age … Continue reading Disease Descriptions