Often when my wife and I go to bed at night our dog ends up sharing the bed with us as well. He is a black dog that weighs about 100 pounds so you can imagine that he takes up a good portion of the bed at night when he decides that he wants to sleep with us. Since we have black sheets he tends to blend in with the bed making it hard to tell if he sneaks up there before us. Most nights, after I turn off the lights and TV and am lying there in the dark, I can hear my dog get off of the floor and he props his (heavy) head on the foot of…