Article about the subject:
https://www.usatoday.com/story/news/politics/2017/09/25/va-tightens-oversight-medical-experiments-dogs-after-surgery-failures-canine-deaths/690684001/
Mom's letter:
https://www.usatoday.com/story/opinion/2017/09/19/former-navy-physician-va-doesnt-need-experiment-dogs/678177001/