Apex domains cannot have CNAME records.
Question and response
Question
dig 360healthpet.com. NS
Answer
360healthpet.com. 1 NS ns-407.awsdns-50.com.
360healthpet.com. 1 NS ns-38.awsdns-04.com.
360healthpet.com. 1 NS ns-1459.awsdns-54.org.
360healthpet.com. 1 NS ns-925.awsdns-51.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0