The new Watch My Domains SED v4 (currently in beta) has a number of new options that make DNS monitoring of your domains and hosts very easy.
You can enable DNS monitoring and alerts from the settings panel. You can also specify alternate name servers to use for DNS checks.
If your DNS provider supports zone transfers (AXFR) you can use it to get the DNS data directly from your provider. Please see DNS Monitoring using AXFR.