It is important to have a sled dog in the logo. (Please look up pictures of Alaskan sled dogs, they don't all look like malamutes.)
It would be great if you could somehow incorporate the idea of "people with disabilities" without making the logo too busy. But I have no idea how this would be done. If in doubt, just leave it out.
Having more than one dog in the logo is OK. This would help relay the idea of a "team". As long as logo is not too busy. (I have seen some dog mushing logo's pull off silhouettes of entire teams.)
Here is our website; http://noblepawsalaska.org/. There is an intro video in the middle of the home page. This will help you get an idea of our mission and personality as well as some images of what we do.
The mood we want. Dog mushing is "cool". Working with people with disabilities is "compassionate". Sled dogs are "energetic". Children are "fun". Wounded warriors are "adventurous". So some combo of cool, compassionate, energetic, fun and/or adventurous. (Most likely not all of these in one logo. Not sure that would be possible.)
If there is one word to describe what we want it would be "Moxie". It seems to incorporate many of the characteristics our our organization, the people we serve and the sled dogs.
The photo of the real dog I attached is my old lead dog. She looks a little goofy in the pic, but despite the silly face she is a "real" sled dog and it would be great if the logo was modeled after her.
FYI: if you put a collar on the sled dog be sure to not include a dog tag. Sled dogs don't have tags on their collars. No bones or chew toys either. They are not pets, they are athletes.
Thanks and good luck.