While initial crosses were touted as being healthier than the purebreds from which they were derived (so‐called hybrid vigor), it is now recognized that these crosses can still concentrate deleterious genes and may develop their own predispositions to disease. Some of these can even be detected with genetic screening in these hybrids.
3.9.5 Mixed‐Breeds
Mixed‐breed pets have always posed a problem to disease risk prediction, since