I am trying to do a natural cover over the next 4 days and this is going to be my 6th breeding. We put them together today and it was not successful. The dog mounts just fine and the bitch is standing for him but nothing happens. The only other time this has happened the dog was just missing, everything ended up on the floor. We chocked it up to experience and the next time we had to help him.. I could be wrong but, this time seem different? We don't think we even could see his lip stick. sure could use some help.