They have never attempted to chew on them that I can see. They might have test nibbled but left it alone once the realized it was metal. Plastic litter pand on the other hand get recognized at chewed instantly, these are defin a good alternative glass baking dishes work as well. My only problem with these is that they have no weight to them, so in the bottom of each one I have a marble tile piece weighing them down.
If you do use them I would be cautious and make sure they are not chewing them/eating them, metal shards would defin be a terrible thing to have in your gut! I check for any signs of chewing each day and so far have found non.
