Sand digging box

Hiya all

So I'd seen loads of people using sand for a digging box.. so thought I'd make one for Stanley.

However...

As much as he loves rolling around in it etc...
We've found he seems to be urinating in it. Which doesn't take long to start smelling.. pretty bad..

Any top tips??

I even got him a tub with a lid and cut a hole out so he doesn't get sand everywhere and my mum made a cosy cushion for him to lay on [emoji1787]

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Is it children's playsand? You need to check Bunny over after he has been playing in it, ears as well.