[HairOfTheDog]

A silly solution I heard about recently was to tie one end of long rope to the collar and an empty milk jug to the other end. Even if the dog gets out, he can't go far.

He'll get snagged on something, yes.... can you be sure to find him? I wouldn't do that.

[MaryFromMichigan]

I think the idea was that the milk jug would snag on the hole in the fence.
Unlikely though.
If the hole was big enough to let the dog escape, the jug could be pulled through, too.
(De- fenceless dog alert)