If you had some concerns over how your neighbors are treating their dogs, would you try talking to them about it or would you just call animal services?

I have a neighbor from a few doors down that owns 3 chihuahuas who as far as I know are strictly outdoor dogs. I don’t really talk to them other than a quick “hello” or “good morning” when I walk by their house. The reason I’m concerned about these little guys is because they always keep them tied and separate from each other. I know one of them has already had at least one litter of puppies and this leads me to believe that they might be using them for breeding. I personally believe little dogs should be indoor dogs but they obviously don’t.

Should I try to express my feelings to them in a polite way or should I just call animal services so they can deal with it?