Why not just get the gas version of the Golf wagon, or the new Golf Alltrack?  Some of the suggestions here are ridiculous - minivans, capped pickups, etc.  Dogs should not be "stretching out" like human passengers when travelling.  Too much space for the dogs means they'll go flying if you have to slam on the brakes or accelerate hard - at serious risk of injury to the dogs.  My Bernese mountain dog easily fits into the hatch of my Golf, and he is very safe there.