Here I go about our neighbors again.. UGH!  

In my state of minnesota we are required by law to have out pets in an enclosed area such as fence or kennel etc. We are to have then licensed with shots updated every year. Licenses every 2 years. We are also to post a sign about warning of a dog. It is then our responsilbility if the dog bites anyone. Wether they were in out yard being asked by us or jumping the fence to get a toy etc. We are the owners therefore we are responsible. A shock collar in Minnesota does not constitute the dog being in an enclosed area. So I would check further into your states law around dog ownership etc before getting irate at the neighbors.
HAPPY POSTINGS FROM GRANDPA BOB !!~

Do you have a regular fence as well as the electric fence? Because that kid (and his father)should have had better manners than to hop your fence without asking anyone. I'm sure your meighbor would have informed them not to do it, since I'[m sure he knows how your dog is.
We have a 6 ft tall privicy fence around our yard, so we never really have thought about what the laws are, but I'm pretty sure if someone climbs the fence and gets bit, we wouldn't be liable, but I'm not so sure that would hold true if there weren't a fence enclousing the area, even if it is still my property. We actually put "beware of dog" signs on our fence just to keep people away from the fence and house. Even though the dog isn't really dangerous, he makes a lot of noise when someone comes near the house or fence.

Although tresppass is against the law here too, I think if a person was bitten by a dog, even whilst tresspassing, the owner of the dog would have hassles.
I agree with you, to be honest. You have done the right thing by having this shock collar, &b there is no need for you have him on a lead in your own home.
People should NOT be trespassing oin youyr people. Kids should always ask first if they want to retrieve a toy.

In our country it is always the owner's liability whatever are the circumstances when a dog bites someone. Even if the person provoked or went inside your vicinity, but if gets bitten by the dog, the owner has to pay or shoulder all the expenses incurred.

we dont have a dog (its not allowed in this apartment and besides, we are total cat people and would choose one of these if it were not forbidden too). But good that you could look up online what laws there are in your state.
The kid has been irresponsible to just go and get his toy plane himself instead of ringing the doorbell and asking you to let him. How irresponsible can someone be with 15 years old that young one should have had a little more brain working. I would never have done this.