I am sure there are more but these are the ones I have found so far.

Alabama

Alabama War Dogs Memorial Foundation

http://www.awdm.org/

California

Rancho Coastal Humane Society (RCHS)

http://www.rchumanesociety.org/workingdogmemorial.asp

Illinois

Northern Illinois Police K9 Memorial

http://www.cpwda.com/k9_monuments.htm

Michigan

Michigan War Dog Memorial

http://www.youtube.com/watch?v=Hw5XolcL6Mc

New Jersey

Dedication of the US War Dogs Memorial, State of New Jersey.
Located at the Vietnam Veterans' Memorial, Holmdel, New Jersey

http://uswardogs.org/video2012/U%20S%20War%20Dogs%20Memorial%20Presentation%20with%20special%20feature,%20Process%20of%20the%20Dream./slides/US-War-Dog-Memorial-2006.html

http://www.uswardogs.org/us-war-dog-memorial/

New York

Hartsdale Pet Cemetery
& Crematory

America's First and Most Prestigious Pet Burial Grounds

http://www.petcem.com/wardogmemorial.html

Pennsylvania

Bristol Township, Pennsylvania

http://www.bristoltownship.org/wardogMemorial.cfm

Tennessee

University of Tennessee College of Veterinary Medicine War Dog Memorial

http://www.vet.utk.edu/wardog/

NATIONAL MONUMENT SITE

JBMF, Inc. in coordination with the Offices of the Secretary of Defense and
Secretary of the U.S. Air Force has officially selected Lackland Air Force
Base, San Antonio, Texas
as the location to build the National Monument for Military Working Dog Teams.

http://www.jbmf.us/

Memorial Locator

http://vdha.us/memorials/

War Dogs…America’s Forgotten Heroes

http://www.war-dogs.com/

War Dog Memorial

http://www.findagrave.com/cgi-bin/fg.cgi?GRid=14798700&page=gr