Last modified: Friday, February 22, 2008 3:23 PM EST Dogs by the numbers Numbers of official dog parks in the country: an estimated 600, according to the Sharon Dog Park Web site Number of licensed dogs in Attleboro: 2,836 Estimated time to develop the Attleboro park: At least 12 months. Possible sites for Attleboro park: 2 - a five-acre triangle bounded by West, Old West and Tiffany streets or a parcel near the city's wastewater treatment plant and animal shelter off Pond Street. Other dog parks known to be under development in Eastern Massachusetts: At least 1, in Somerset