Depending on where you live, you have a few possibilities. First, I'm assuming that you do not have an HOA. The premise of an HOA is that they can enforce certain restrictions, even if the law cannot/will not. I'm also writing this with the assumption that you are in the US.
If they are breaking the law, you may need to find ways to encourage the local authorities to take action. Generally, this involves doing the cops' jobs for them. The company CompuTrace, makers of LoJack for laptops, has been criticized for selling (at a high price) software that does very basic tasks that anyone can do to collect evidence on the thieves. But what they really sell is that they can use that evidence to spur the police into action, since it's an easy win. You'll probably need to talk to an attorney, or at least the prosecutor's office (not the police) to find out what they need.
Also, be sure that you have contacted all of the relevant agencies. The burn pit may need to be addressed by the fire department (especially in times of wildfire risk), or an environmental agency. They sound like irresponsible pet owners, which might be of interest to the humane society or animal control.
If they haven't broken any laws that you know of, you still might be able to sue them. You have no say in how they choose to live their lives, but you can get an injunction on how it impacts you and your property. The dog bites, specifically, are likely actionable. Loud noises probably are not.
In any event, talk to an attorney. I'm not even sure what type you would need, but the bar association can probably help.
In the US, completely unpaid internships are rare. Most are paid, but fairly poorly. There are a few major reasons for this:
You have to meet a lot of requirements for unpaid to be legal, and it all has to be documented.
Internships are a "farm" program- many interns are offered and accept a full time position afterwards. If they were unpaid, they are unlikely to accept.
Minimum wage is an absolute joke everywhere in the country. Why bother fighting it when you can pay as little as $7.25/hour? Even doubling or tripling that makes it appealing to poor college students and the farm program, and won't cost much.
(Your example would be illegal in the US, and possibly even enforced)