big dogs won't jump

I ordered this contraption today in the hopes of being able to load up the monsters more smoothly than crawling in the passenger door of the truck and coercing them with promises of cookies and fun times.

linky

It claims to hold 300+ pounds, so why don't they put a giant breed dog in the picture instead of a tiny lab/retriever? We'll see what happens when Clyde Dog puts it to the test. Barker will likely still need to be hoisted in because steps don't work for him anyway. Sometimes I wish I had a station wagon.