Apex domains cannot have CNAME records.
Question and response
Question
dig greggorywildedds.com. NS
Answer
greggorywildedds.com. 4 NS ns-866.awsdns-44.net.
greggorywildedds.com. 4 NS ns-737.awsdns-28.net.
greggorywildedds.com. 4 NS ns-1726.awsdns-23.co.uk.
greggorywildedds.com. 4 NS ns-1159.awsdns-16.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0