Slow Cook Barbecue Chicken

4-6 skinless, boneless chicken breast halves (I used 4 large breast that were partially frozen)
1 (18 oz.) bottle of barbecue sauce
1/2 cup prepared Italian salad dressing
1/4 cup brown sugar
2 tablespoons Worcestershire sauce

Place chicken in crock pot. I a bowl mix 2/3 of the bottle of barbecue sauce, Italian Salad dressing, brown sugar, and Worcestershire sauce. Pour over chicken. Cover and cook for 3 to 4 hours on high or 6 to 8 hours on low. (I cook on low) Remove chicken from crock pot. Pour juices from crock pot into a large bowl. Shred chicken and place back in crock pot. Add remaining 1/3 of bottle barbecue sauce to chicken an d mix. Then add some of the liquid removed from the crock pot to make the chicken the wetness that you like it. Makes at least 8 sandwiches