In a couple of the Adventrues of Sherlock Holmes, a dog cart is mentioned. I have heard of small carts being pulled by a dog, but doubted that in the stories that was what was being referred to. My dictionary gives as second meaning, a type of cart, with small carrying compartment for a sportsmans's dog.
dogcart
n.
1 a small, light cart drawn by dogs
2 a small, light, open 19th-cent. carriage, usually with two wheels, having two seats arranged back to back: it originally had a box under the seat for a sportsman‘s dog

In the story, a second mention says it was pulled by a horse.

Thank you! I had often wondered why some of the people riding in dog carts couldn't afford horses or at least ponies.

Speaking of nouns associated with dogs, what is the architectural feature on houses called in which there is an open breezeway between two mostly independent structures? It is a term that has 'dog' in it--and I can't for the life of me remember the term. Dog run? No, I don't think that's it. Isn't a dog run just an area where dogs get their exercise?

wwh, forgive the tangent, please. I, too, have wondered about the size of those dogs that had to pull those dogcarts.

Dear WW: I posted about that a year ago, and of troy added some material.
I got it from some stories I used to read to my kids. Before WWII, poor white in South for comfort in very hot weather, had the house divied lengthwise into three equal areas. The middle third was open at both ends to let the breeze through, and was called the "dogtrot". That's all I remember now.