That's why I use a Tarptent (in my case, the Tarptent/Gossamer Gear Squall Classic). I need a bug-free space for both me and my dog. By the time you add to a tarp a groundsheet for two, a lightweight bivy to protect the sleeping bag from splash and netting big enough for two, you have as much weight as the lighter single-wall tents. There's also the consideration that my dog thinks of my tent as a crate, so he curls up contentedly inside. I'm of course not about to test that attitude by going off and leaving him in the tent, though!