IanMunro – If the op feels his woodworking skills are up to it then yes it could have a multitude of trail features in it 😉
TheRealHoops – If it makes any difference you can buy them already made 😕 .
On a serious note though if you feel that the dog is a threat to you and or your family then it might be worth contacting a local vets practice. Although they won’t be able to do anything themselves they may well be able to point you in the right direction of someone local to you who can help, local dog warden if your council has one RSPCA, Dogs Trust etc etc. Remember that a dog barring its teeth is normally a defensive reaction to a situation and it may not act in the same way if approached differently. I assume you went to pick it up to help it back over the fence and if it doesn’t know you and you were standing over it, possibly leaning over it in an attempt to pick it up it would quite possibly have felt threatend by you. It doesn’t make it a vicious dog because it bares its teeth at you, i do however understand that you don’t want to find out if its vicious or not the hard way. Oh and for the record the neighbour who owns the dog sounds like a tw*t for not taking your complaint more seriously, maybe if a dog warden RSPCA etc had a word they might get a different reaction.
Good luck with getting it sorted 🙂