A "Gross" Misunderstanding

Yesterday, Canaan was watching a show about a farm. All was well until I heard an unearthly shriek from his room. My first thought was that somebody had flipped the switch that controls the television, so I went to fix it. The television was still on, however, and Canaan was gesturing toward it agitatedly. On the screen was a pig sitting in a pen, covered in mud. He started yelling "Mommy! Mommy! You need to CLEAN THIS PIGGY! He is covered in POOP! OH NO!" He was really upset and I was having SUCH a hard time not laughing about it! He calmed down once I explained it was dirt, but now every time he sees the pig he comes to me to confirm "Piggy is just dirty? Not poopy?"