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Hello. Thanks for the question.
I would personally recommend just taking the dog to a local animal control or rescue or shelter. They will often times house the animal and care for it while trying to locate the owners. There may end up being some type of fee for the service, but they would at least make sure the dog is warm and fed. If the owners don't come forward in a reasonable amount of time, then they put it up for public adoption. A pointer should have no problem getting adopted.
If you don't want to go that route, then I would personally go get the dog and keep it in your house until the owners come back. You can keep it housed and fed and wait for the owners to come back home. You can leave a note in their mailbox so they know where their dog is.
Lastly, you could just put a dog house and some blankets over the fence. You could also provide food and clean water daily. It's not the ideal situation, but it's a last option.