Frozen litter trays!

My bunnies are outside in a playhouse. When I went out this morning to feed them and change their trays, the litter that had been peed on had froze! any ideas how I can stop this happening? (their water bottles and bowl were fine)

A heat pad in or under the tray?

Buuny_Friend said:

A heat pad in or under the tray?

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now why didn't i think of that thanks x