http://kck.st/2tlFgJX
This Swedish designed detachable sidecar for your bike goes by “SideBuddy”. It’s on Kickstarter right now (base model $450) and its actually not that bad of an idea. Might not be the most efficient but the joy of have a dog or kid riding shotgun should outweigh whatever additional drab you might create as opposed to the traditional tow-behind cargo trailers. 
HERE ARE THE SPECS:
- Weighs 20 kg
- Carries up to 120 kg
- *Made of extra light materials:
- ABS Plastic Structure
- Fiber Glass Body
- Aluminium Composite Flooring
- Carbon Steel Rear Chassis
- Stainless Steel Front Chassis
- Magnesium Alloy Wheels
- Dual Brake Disk System
