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Title: Beware!
Review: We purchased the large size for our young lab and used it in an insulated shed for the winter. About halfway through the winter, we noticed circular cracks in several places, which eventually broke off in pieces. This caused it to quit heating, so we took it all apart and found that her weight (74#) caused the molded plastic support circles that were inside to poke through the plastic cover and ruin the unit. Don't know what we'll do next winter, but I'm not buying another one of these. The large size should accommodate the weight of a large dog and last more than a few months.
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