<human>: Give me the gist of the text in a nutshell

My next-door neighbors keep their two dogs in a state of borderline neglect. They have food and water, sleep indoors, and are allowed briefly into the small backyard twice a day. But the large and energetic dogs (mixed retrievers) almost never leave the property, are untrained, and spend most of their lives alone in one small room.

A few times they've asked me to watch their dogs for the weekend. I've always said yes, otherwise kept my mouth shut, and been sure to walk them for some real exercise and stimulation. I think that's the best I can do for the dogs -- there's no chance animal control will intervene, and little chance I can change my neighbors' behavior.

But. I also worry that my help enables my neighbors to keep dogs they shouldn't have. And I wonder whether I have a moral obligation to say something, even if I believe doing so will have no effect. 

**Other details, possibly relevant:**

* For a while, they engaged a professional dog-walker/sitter, but she objected to the dogs' living conditions, told them so, and quit. So did a neighbor who preceded me as fallback dog sitter.

* I suggested kenneling for vacations, but they said it's too expensive.

* Our children are similar ages and will be in school together for many years. My kids love walking their dogs but will be too little to do it themselves for a few more years.

* The dogs, predictably, are nervous wrecks who jump and bark incessantly during their brief trips outside. Most of the neighborhood hates them, although I do not.
<bot>: My neighbor dogs have a sad life, though there's nothing to report to animal control. Should I keep dogsitting? Should I say something and, if so, what? What else should I do, if anything?