Nope. They don't put off that much heat. It is common in areas that don't have city water to put these flood lights in pump houses to keep the water from freezing. A flood lamp is not a heat lamp but does produce some heat. Even adding a plastic door (heavy plastic like on cooler doors slit in the center) and a 60 watt bulb can really make a dog house that size nice and warm. I would suggest wireing it so the dog can't chew wires but it is extremely unlikely the dog will chew the light itself while on. I use this same method when real cold on smaller houses as well. I just put the light shining on the outside of the house. It helps keep the house warm and slows hear exchange.
I was thinking a light outside the houses could work but inside a dog house is just bizarre to me. :lol: