I went to www.google.com and found the site www.geobop.com/Symbols/Animals/index.htm and found the following:

Lousiana: Catahoula Leopard Dog
South Carolina: Boykin Spainiel
North Carolina: Plott Hound
Virginia: American Fox Hound
Wisconsin: American Water Spaniel
Pennsylvania: Great Dane
Maryland: Chesapeake Bay Retriever
Massachusetts: Boston Terrier
Alaska: Malamute

It doesn't appear to be a national thing.