As you all know, dogs aren't allowed in Baxter state park. I just wanted to pass along my excellent experience with Connie McManus in Millinocket. She will meet you at Abol Bridge and pick up your dog and keep them for you. In my case, she kept my mutt in her house with her other 5 dogs and grandchildren so my dog had a great time and felt right at home. She also gave her a bath and everything was very reasonably priced.
Two thumbs up!
Also, if you're stopping at Monson, Shaw's allows dogs, Phil Pepin does not. (He first said mine would be ok, but after our two dogs played for over an hour mine got a little rambunctious and Phil got very upset and threw us out. Note that my dog had no problems with Ringo at Shaws or any of the 5 dogs at Connie's, so...)
Az