[RobbyS]

In much of the world, dogs are scavangers. When Gutenberg was looking for some material to apply ink to his type, he hit on dog skin. The streets of Mainz were full of these mangy animals. Their skin has no pores. The same feature made dog skin a popular material for gloves. Even today Muslims do no share our sentimental regard for pooches. The problem arises when one thinks of human beings as tools. The eugene ists had an Aristotelean view of much of humanity, which had it that some men were natural slaves. The biologists who experiment with human embryos and mouse embryos with sovereign indifference, evidence the same view.

[allmendream]

What does the use of dog pelts or their scavenger nature have to do with anything?

Biologists who do experiments with human or mouse embryos are not working from the assumption that some humans are natural slaves, they are working from the assumption that all humanity might benefit from their research.