Dog breeds must be 'rebooted' to halt health problems, says expert
theguardian.com
theguardian.com
We had a kennel for a while; we did several litters of Great Dane / Collie (our keepers lived to ages of 12 and 16, and were healthy throughout). Then we switched to Bluetick Coonhound / Catahoula, and still have several of those (impossible to fence in).
Look at the grain that the world eats: it's almost all hybrids. The seed corn / soybean farms are a sight.