good news, bad news
Some of the ideas and suggestions you gave me are very good. However, there are a few problems.
Harnesses and collars for Ambre won't work. I got him a cheap nylon collar when he was younger, and it took him all day to nibble through it. We also tried to put him on a leash, but he didn't like it.
Also, there is a fence between my property and Buddy's owners' property, but we've always seen him in the front yard, since he passes by the fence on his way out of his yard.