The -o command line option of pg_dump for a database using foreign keys

PostgreSQL 7.1.2 Administrator's Guide says as follows:

Chapter 8. Backup and Restore
8.1. SQL Dump

Important: When your database schema relies on OIDs (for instances as
foreign keys) you must instruct pg_dump to dump the OIDs as well. To do
this, use the -o command line option.

Is the -o option still required for 7.1.2 version for a database using foreign
keys?

Only if you use object ids (OID's).

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