Juvenile renal dysplasia (JRD) has been reported in several dog breeds. Affected dogs often show a reduced growth compared to their littermates and they die during the first year of life due to a failure of the kidneys. JRD is not yet comprehensively described in the scientific literature and the mode of inheritance is currently unknown. We would like to further investigate this disease. Our aim is the development of a genetic test, which allows the reliable detection of carriers. For our research we need EDTA blood samples from affected dogs, ideally together with their parents and siblings. We therefore ask breeders and owners to donate samples for our research. If possible, a suspected diagnosis of JRD should be confirmed by a pathological examination.