The backyard dog is fast becoming a thing of the past. Decades ago, it was common for dogs to live their entire lives outside in suburban and urban yards. But as our knowledge of canines has evolved, we've learned that staying outside 24/7 can be hazardous for a dog's health.ecades ago, it was common for dogs to live their entire lives outside in suburban and urban yards. But as our knowledge of canines has evolved, we've learned that staying outside 24/7 can be hazardous for a dog's health.
Rear-wheel drive (RWD) typically places the engine in the front of the vehicle and the driven wheels are located at the rear, a configuration known as front-engine, rear-wheel drive layout (FR layout). The front mid-engine, rear mid-engine and rear engine layouts are also used.
Still, most passenger cars sold in the U.S. today use a two-wheel-drive system in which the entire drive package â engine, transmission, differential and the wheels that are driven by the engine â are all in the front of the vehicle. It is called front-wheel drive (FWD) and has become ubiquitous in cars since the late 1970s. Trucks, though, as well as many SUVs and some cars, still use rear-wheel-drive (RWD) systems, in which a long driveshaft transmits power from the engine in the front of the vehicle to the driven wheels at the back. A differential is used to let the power from the driveshaft make a 90-degree turn so it can get to the wheels.