Mt St. Helens
No, Mt. St. Helens did NOT explode because it's only company was it's own reflection.
But breeding domestic animals together, who look like reflections of each other, is NOT a good idea.
Nature has a better selection process than what dog breeders have.
We need to open up the gene puddles and let then become a series of lakes, not puddles anymore.
American purebred dogs, like those shown in Pedigree Dogs Exposed (YouTube in 6 parts, very good), have been inbred, and have health problems. We need a better system.