For the last two nights, my 6 month old pup has been having some sort of diarrhea problem. He is fine all day, but starting around 10pm, he starts getting up every hour or half hour he wakes up and starts whining to be let out. When he gets out he runs to the edge of the property and lets out a dribbly stinky mess. This continues until about 6am, by which time I have lost an entire night of sleep. I am pretty sure that by the time the sun starts to come up, he has nothing left to poop, but I don't want him trying it inside anyways. From then on he is fine for the rest of the day.
I was thinking that he might be trying to force it out as a way to mark territory, because he is always going in different spots along the fence, but why in the middle of the night?
Nothing has changed in his diet except for a dental chew stick, but he has had those for several days before the problem and I took them away after the first night. Any ideas? The sleep deprivation is killing me.