Our 1.5 year old Basenji, Meeko, has been kennel trained since the day we got him. Recently, we have been coming home to massive poo explosions after an 8 hour day at work. He's done it 3 times in the past month or so and has gotten a clean/negative stool sample result from the vet. We haven't changed his food, nor has he been eating any people food. He isn't getting into things he's not supposed to since he is in his crate. Anyone else having weird bowel issues? Thoughts on what could be causing this?