Most Hennesy's load from the bottom. Most others are top entry. Of all my hammocking buddies, no one has there dog in the hammock with them (either hennesy or other). I highly doubt this sharing idea will work unless it is a tiny dog that sleeps on your chest. Another thing to consider is that even with just a tarp and a ground setup, many dogs are on alert all night long due to being exposed, visibly, to the outside. Many will not sleep, or not sleep well. Most dogs want an enclosed area when they sleep. My suggestion; you are better off with a lighter tent.