Why does it take so long for a dog to poop?

Geez.. My dog barks to go out, we go out, he barks to come in, we come in, he barks to go out, we go out, he barks to come in, we come in, this whole ordeal goes on for an hour or so. When he finally decides its really time to do this, he barks and knawls all over my feet, arms and head. We go outside for the 7th time. He runs from one side of the front yard to the other, head is held up high, with a nice smooth run as if he was in the purina dog show going for best in show. After 15 minutes of looking for the right spot, he circles his spot and circles and circles and circles. We go through atleast 10 circles. Finally he squats to let it out.. nope he's back at it again. some more circles.. Ok.. here we go he squats again.. nope not the right spot back across the yard. Now he is barking.. Finally a spot. He squats, the poop comes out, he kicks the grass with his back paws and tries to cover it up. While all this is going on, I am dodging a damn bat that is nose diving at my head several times. We finally come in. I give him his snack for being a good boy and there he is at the door wanting to go back out. We go back out he runs straight into the grass squats and pees. Like we could not do this all in 1 trip. Back inside another snack and he goes to sleep. This whole production took over 1 hour and 30 minutes.