I got The Walkabout Rear Harness and it WORKS!
material (like a wet suit) is stretchy, strong and comfortable. It is easy to move your dog around even with a large dog (and I am a not so young female with a huge dog). They can go to the bathroom with it on and you can support them to do so. It is easy to clean and dries fast. It is easy to put on and to use. I have tried the Bottoms Up Leash which was worthless on my 120 pound dog a few years ago as it just pulled his legs apart and made it harder or impossible...