Apex domains cannot have CNAME records.
Question and response
Question
dig ggartpet.com. NS
Answer
ggartpet.com. 5 NS ns-1518.awsdns-61.org.
ggartpet.com. 5 NS ns-122.awsdns-15.com.
ggartpet.com. 5 NS ns-536.awsdns-03.net.
ggartpet.com. 5 NS ns-1386.awsdns-45.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0