X0202 4 2008-01-14 0 0001071625 DOVER SADDLERY INC DOVR 0001044321 MARXE AUSTIN W & GREENHOUSE DAVID M C/O SPECIAL SITUATIONS FUNDS 527 MADISON AVENUE, SUITE 2600 NEW YORK NY 10022 0 0 1 0 Common Stock 2008-01-14 4 P 0 600 3.9933 A 702785 I By Limited Partnerships This is a joint filing by Austin W. Marxe (Marxe) and David M. Greenhouse (Greenhouse). They share voting and investment control over all securities owned by Special Situations Fund III QP, L.P. (QP) and Special Situations Cayman Fund, L.P. (CAY). 660,164 shares of Common Stock are owned by QP and 42,621 shares of Common Stock are owned by CAY. The interest of Marxe and Greenhouse in the shares of Common Stock owned by QP and CAY is limited to the extent of his pecuniary interest. Austin W. Marxe 2008-01-16 David M. Greenhouse 2008-01-16