I've head two things as to why not to use heat rocks.
1. they do not have thermostat controls, and it would be near impossible to use a typical thermostat on one, as the probe would not stay on the surface very easily.
2. they make a concentrated hot spot, instead of a large hot area. Then the animal has to squish themselves onto it, but they never warm their entire body up, so they stay on it, overheating one small area(usually the belly) and thus burning themselves.
Overall, cut the cord off and use it for a doorstop.
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