http://www.vhslifesaver.org/adoption/dogs.php This is the shelter where my student has a volunteer "job" 1 1/2 hours every afternoon.
Jolie has been at the shelter for almost 2 months. She is very quiet and reserved in the kennel but loosens up outside. Sweet girl. I'd call her a large medium dog.
Josie is older which will make it harder for her. She's a sweet dog who always quietly comes to stand at the gate and wag her tail and smile when someone approaches her kennel. I'd also classify her as a medium dog instead of large.