40 x 50 feet ? Holy crap that's funny. Teach them to go in the neighbors yard, assuming they have one. I wouldn't even have a dog with a "yard" that small. Borders on animal cruelty.
Kidding right? My yard in the back is about double that. With the 6ft vinyl fence I can shoot my bow 25 yards, my air rifle and teach my lab basic obedience and hand signals. 40x50 isn’t bad, how many serious dog owners have kennels outside anyway and take the dogs elsewhere for serious training.
My next dog will be a setter and I’m putting in a kennel for the days I have to leave her.