UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934

                               (Amendment No. 4)*

                         OIL-DRI CORPORATION OF AMERICA
                                (Name of Issuer)

                                  COMMON STOCK
                         (Title of Class of Securities)

                                    677864100
                                 (CUSIP Number)

                                December 31, 2001
             (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

     [X]  Rule 13d-1(b)
     [_]  Rule 13d-1(c)
     [_]  Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                                Page 1 of 6 pages

CUSIP No. 677864100                  13G                       Page 2 of 6 Pages

1.  NAME OF REPORTING PERSONS
    I.R.S. IDENTIFICATION NOs. OF ABOVE PERSONS

                    HEARTLAND ADVISORS, INC.

                    #39-1078128

2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

                                                      (a)  [_]
                                                      (b)  [_]

3.  SEC USE ONLY

4.  CITIZENSHIP OR PLACE OF ORGANIZATION

                                WISCONSIN, U.S.A.

- --------------------------------------------------------------------------------
                NUMBER OF                5.  SOLE VOTING POWER
           SHARES BENEFICIALLY
                OWNED BY
                  EACH                          305,000
                REPORTING
                 PERSON                  6.  SHARED VOTING POWER
                  WITH                           None

                                         7.  SOLE DISPOSITIVE POWER

                                                 873,600

                                         8.  SHARED DISPOSITIVE POWER
                                                 None

- --------------------------------------------------------------------------------

9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          873,600

10.  CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES  ______

11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          16.0%

12.  TYPE OF REPORTING PERSON

          IA

CUSIP No. 677864100                  13G                       Page 3 of 6 Pages

1.  NAME OF REPORTING PERSONS
    I.R.S. IDENTIFICATION NOs. OF ABOVE PERSONS

                    WILLIAM J. NASGOVITZ

                    ###-##-####

2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

                                                      (a)  [_]
                                                      (b)  [_]

3.  SEC USE ONLY

4.  CITIZENSHIP OR PLACE OF ORGANIZATION

                                     U.S.A.

- --------------------------------------------------------------------------------
                NUMBER OF                5.  SOLE VOTING POWER
           SHARES BENEFICIALLY
                OWNED BY
                  EACH                          450,000
               REPORTING
                 PERSON                  6.  SHARED VOTING POWER
                  WITH                          None

                                         7.  SOLE DISPOSITIVE POWER
                                                None

                                         8.  SHARED DISPOSITIVE POWER
                                                None

- --------------------------------------------------------------------------------

9.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          450,000

10.  CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES  ______

11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          8.2%

12.  TYPE OF REPORTING PERSON

          IN

CUSIP NUMBER 677864100                                         Page 4 Of 6 Pages

Item 1.
     (a)  Name of Issuer:   Oil-Dri Corporation of America
          --------------

     (b)  Address of Issuer's Principal Executive Offices:
          -----------------------------------------------
             410 North Michigan Avenue, Suite 400
             Chicago, IL 60611-4213

Item 2.
     (a)  Name of Person Filing:   (1) Heartland Advisors, Inc.
          ---------------------
                                   (2) William J. Nasgovitz

     (b)  Address of Principal Business Office:
          ------------------------------------
             (1)  789 North Water Street          (2)  789 North Water Street
                  Milwaukee, WI 53202                  Milwaukee, WI  53202

     (c)  Citizenship:  Heartland Advisors is a Wisconsin corporation.
          -----------
                        William J. Nasgovitz - U.S.A

     (d)  Title of Class of Securities: Common Stock
          ----------------------------

     (e)  CUSIP Number: 677864100
          ------------

Item 3.   The persons filing this Schedule 13G are Heartland Advisors, Inc., an
investment adviser registered with the SEC, and William J. Nasgovitz, President
and principal shareholder of Heartland Advisors, Inc. Mr. Nasgovitz joins in
this filing pursuant to SEC staff positions authorizing certain individuals in
similar situations to join in a filing with a controlled entity eligible to file
on Schedule 13G. The reporting persons do not admit that they constitute a
group.

Item 4. Ownership.
        ---------

    (a)   Amount beneficially owned:
          -------------------------
          873,600 shares may be deemed beneficially owned within the meaning of
Rule 13d-3 of the Securities Exchange Act of 1934 by (1) Heartland Advisors,
Inc. by virtue of its investment discretion and in some cases voting power over
client securities, which may be revoked; and (2) William J. Nasgovitz, as a
result of his position with and stock ownership of Heartland which could be
deemed to confer upon him voting and/or investment power over the shares
Heartland beneficially owns. Of these 873,600 shares, 450,000 shares also may be
deemed beneficially owned within the meaning of Rule 13d-3 of the Securities
Exchange Act of 1934 by Mr. Nasgovitz as a result of his position as an officer
and director of Heartland Group, Inc. which could be deemed to confer upon him
voting power over the shares Heartland Group beneficially owns.

     (b)  Percent of Class:
          ----------------
          16.0%

    (c)  For information on voting and dispositive power with respect to the
above listed shares, see Items 5-8 of the Cover Page.

Item 5.   Ownership of Five Percent or Less of a Class.
          --------------------------------------------

          If this statement is being filed to report the fact that as of the
date hereof the reporting person has ceased to be the beneficial owner of more
than five percent of the class of securities, check the following:[_]

Item 6.   Ownership of more than Five Percent on Behalf of Another Person.
          ---------------------------------------------------------------

          The shares of common stock to which this Schedule relates are held in
investment advisory accounts of Heartland Advisors, Inc. As a result, various
persons have the right to receive or the power to direct the receipt of
dividends from, or the proceeds from the sale of, the securities. The interests
of one such account, Heartland Value Fund, a series of Heartland Group, Inc., a
registered investment company, relates to more than 5% of the class.

Item 7.   Identification and Classification of the Subsidiary Which Acquired the
          ----------------------------------------------------------------------
          Security Being Reported on By the Parent Holding Company.
          --------------------------------------------------------

          Not Applicable.

Item 8.   Identification and Classification of Members of the Group.
          ---------------------------------------------------------

          Not Applicable.

Item 9.   Notice of Dissolution of Group.
          ------------------------------

          Not Applicable.

Item 10.  Certification.
          -------------

          By signing below, the undersigned certify that, to the best of their
knowledge and belief, the securities referred to above were acquired and are
held in the ordinary course of business and were not acquired and are not held
for the purpose of or with the effect of changing or influencing the control of
the issuer of the securities and were not acquired and are not held in
connection with or as a participant in any transaction having that purpose or
effect.

                                    SIGNATURE

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

DATE: January 15, 2002

WILLIAM J. NASGOVITZ                        HEARTLAND ADVISORS, INC.

By: /s/ PAUL T. BESTE                       By: /s/ PAUL T. BESTE
- ---------------------                           -----------------
    Paul T. Beste                               Paul T. Beste
    As Attorney in Fact for                     Chief Operating Officer
    William J. Nasgovitz

EXHIBIT INDEX

     Exhibit 1      Joint Filing Agreement

EXHIBIT 1

                             Joint Filing Agreement

The undersigned persons agree and consent to the joint filing on their behalf of
this Schedule 13G in connection with their beneficial ownership of Oil-Dri
Corporation of America at December 31, 2001.

WILLIAM J. NASGOVITZ

By: /s/  PAUL T. BESTE
    ------------------
    Paul T. Beste
As Attorney in Fact for William J. Nasgovitz

HEARTLAND ADVISORS, INC.

By: /s/ PAUL T. BESTE
    -----------------
    Paul T. Beste
    Chief Operating Officer