Would you ask your neighbors this?

[msmerymac]

I'd definitely ask. I live in a sort of village like area with village sized lots, and the neighbor on one side has a fence on the property line. The neighbors on the other side only have a fence in the back of their yard, but it's the same fence as other neighbor. Our garage also created a separation between our backyard and the neighbor. Because of that, if we want to fence in the back of our yard and the smaller areas that aren't already fenced, we'll just do the same style at the other neighbors and ask if we can hook in with the existing fence and help with maintenance. Win/win.