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Building a heated outdoor dog run? - heated outdoor dog bed

I need help designing a hot fight for my older dog.
Betsy is a cross / Spaniel Corgi (which includes a layer thickness) with the hip --
Dysplasia of the spine, and arthritis. It still has many years ahead
in it, and I think my faithful companion comfortable. They
was a dog in his life, but now in control of the bladder have
Problems. A career with a stand of hot dogs in the open seems to be
Answer, but I'm not sure how the heat safely and effectively. I
ready to build a concrete fence with steel or wooden basin, and
It is a beautiful dog entered the house. It seems that I can provide a heat
the lamp in the dog house, plus a heating pad on his bed, but the
enough to be as warm as it is in the house? Is it safe?
It should in principle also hold cables in concrete to warm and dry?
And if so, how they made safe? I welcome shade and protected
Situation in view of the construction of race, providing access through a
Puppies in the door, when we choose.