I forgot my usual disclaimer about flexis. Do not walk your dog with a flexi unless it is locked. Mine cannot reach the street or our property line if I am standing on the porch with the flexis. I use the 26 foot ones because they have less tension than the 16 foot ones, which is good for tiny dogs. When we go for walks we use 4' leashes
I agree about STAY. Loki has a great stay inside and even outside on a leash. He knows he must have a leash on to go outside. I just know that if he saw something he considered "scary" (a big dog) I would lose his attention. It truly is about knowing your dog. Sammy is still learning so we have to be careful with her. She tries to run outside to greet people when they open the door, but then follows them right back in. Luckily we don't have squirrels at our house, but my mom does and I know she would bolt after a squirrel.