Apex domains cannot have CNAME records.
Question and response
Question
dig thebestpetstuff.com. NS
Answer
thebestpetstuff.com. 5 NS ns-139.awsdns-17.com.
thebestpetstuff.com. 5 NS ns-1025.awsdns-00.org.
thebestpetstuff.com. 5 NS ns-563.awsdns-06.net.
thebestpetstuff.com. 5 NS ns-345.awsdns-43.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0