Add/landscape review of dog data

[mellybelly]

Discussed with @kshefchek see: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0091172 https://www.broadinstitute.org/scientific-community/science/projects/mammals-models/dog/dog-genome-links https://research.nhgri.nih.gov/dog_genome/

need to do more research on sources @jmcmurry