
l have use them for 5 litter i think their better than elc heat pads or heat lamp.
i put the heat pad in a hot water bootle cover last cover was shaun the sheep the puppies from day two found the heat nestlle into the cover.
that reminds me to go a buy two have lost one
but i use them on my back and knee when they are playing up
plus in my bed in the winter they are still warm in the morning,