No, dog houses do not necessarily need legs to work as a shelter for your pooch. However, allowing the dog house to be elevated off of the ground does make the floor cooler by allowing fresh air to circulate underneath it.
Allowing fresh air underneath the dog house will keep the interior flooring cooler, and therefore keep your dog cooler as well.
It is worth considering a dog house with elevated legs if you’re looking for one to use in the height of summer.
Plus, elevated legs will keep the floor from trapping water below the dog house in winter and reducing its lifetime.
Plastic exposed to frozen conditions can become brittle and break easily, while wood is more likely to rot and become unstable.