@PiggySmitten loves using hers to keep her piggies warm and I don't mean the guinea piggies
They should get used to them, don't use them without the cover as ive seen some pictures of piggies with burns apparently from heat pads but I'm not sure they would lay on it for long enough to get a nasty burn.
They are a clever thing I like them, just a shame they are so hard making it not comfy to lay on.
I was too I think they must take some getting used too, they will fit perfectly in my hive igloos with a blanket on top but I wonder if they would be too hot thenHaha my mum said she wanted one. I was also surprised at how hard they were! I was expecting something soft like a hot water bottle.