Nope, originally a car dog house is actually the front clip. I'm thinking the term dog house comes from back in the day when a junk yard would have the front clip removed from a car before crushing the shell. The yards wouldn't part out a complete clip or doghouse since it was more valuable as a whole unit. And if there is a junkyard dog around and you look at the clip from behind, you can see a dog using it as a dog house.
Then again, most of you are not old enough to remember junk yard speak.
I absolutely remember that and I don't think I that old but maybe I am, but ever since I've been on the RV forums I've seen the term used for the engine housing on a Class C or van, or some front engine A's.
I also remember when people started using "front clip" more commonly than doghouse. But then I spent a lot of time at salvage yards when I was younger.