There are several pet boarding services near MOA.
Whether you take your dog or not really depends on the type of 3 week vacation you are planning. If you are planning to be in locations that offer natural areas (state parks, national forests, etc), you plan on doing a lot of hiking or being outdoors where the dog can be with you, then it might be ok.
However, if you are planning on doing a lot of indoor things (museums, shopping, historical building visits, etc.) then it may not be the best idea to take your dog.
