An interesting study marks the evolution of dogs and humans in tandem and has found surprising similarities in our genome . . . both species seem to evolve in tandem. Studies trace the genomes for thousands of years and have discovered that human and dogs have tracked similar changes in neurotransmitters, cholesterol and cancer genomes. All this affects diet, personality and interaction.
Much of it can be attributed to the living environments of both species are similar...well exactly the same since we live together, so those outside stimuli that affect and impact humans have a similar impact on dogs.
This is why you should never eat a dog!!! They are you!
Read the full article at National Geographic.