I don't know if this is just my local garden centre,but. When they have stone (bigger than gravel sort of stuff) delivered it comes on a pallet with this really strong wire mesh around it. The chap gave it away free because the company was charging him to take it away . I have used it in lots of way.
Firstly it is very strong I used a machine (grinder thingy) to cut it up. Here are at least two uses I have found. I cut it to shape, split some old hose pipe wrapped it around the rough edges and secured it with ties then just added elasticated rope and hooks Voila Dog guard.
Also used to just prop into place around plants that are either flopping over or being trodden on ( in my case by a rather heavy GSD) I have added these photos to give a size perspective (dog looking a bit apprehensive at being boxed in by the coal bunker
yippee I did it. Might I say without any direct help ! well I did have to go back through the search route. and thanks there were instructions. Not to self don't be lazy.

On the issue of animals for research "The question is not, 'Can they reason?' nor, 'Can they talk?' but rather, 'Can they suffer?'" Jeremy Bentham