The OFA collects information on many types of companion animal diseases. Some must be DNA tested (genotypic), while others are visible by external physical characteristics (phenotypic).

gen·o·type

(jĕn′ə-tīp′) n. The genetic makeup, as distinguished from the physical appearance, of an organism or a group of organisms.
See list of OFA databases for DNA Tested diseases.
DNA Test Collection Instructions: Cheek Swab or Blood Sample

phe·no·type

(fē′nə-tīp′) n. The observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences.
See list of OFA databases for phenotypic diseases.

If you’re looking for statistics on diseases for a particular breed,