Apex domains cannot have CNAME records.
Question and response
Question
dig medhorses.com. NS
Answer
medhorses.com. 5 NS ns24.domaincontrol.com.
medhorses.com. 5 NS ns23.domaincontrol.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0