[lovespandp]

Here is another option:

Personally if it were me, I would get a picture or two of the cat in my home, and after that attempt to make a resolve with the neighbor as to keeping their cat under control once more. If again this is to no avail I would contact the local law enforcement and explain the happenings - also keep documented the events from here out. You may have to resort to legal action, possible consult with a lawyer as to the owners responsibilities.
Does this neighbor own or rent ? Perhaps if they rent you can bring it to the attention of the landlord of that property.
This is very unsanitary to say the least and opposing possible health concerns, go the legal route should trying to negotiate with the neighbor fails again