The Animal Rescue League of Boston posted the attached photo on its Facebook page Sunday with the following caption:

“This dog was found a few hours ago by a concerned citizen behind an Arlington school. The dog is now getting the emergency treatment it needs. We have no further info [at] this time, but we’ll keep everyone posted as soon as we hear anything. Our thoughts are [with] this sweet little puppy :( … “

If you have any information about this dog, you can call the Animal Rescue League of Boston at 617-426-9170.

Check back with Arlington Patch for updates as they become available.