Mucky Pup can never sit still, and he is never happier than when he's chasing something, or sniffing something out. That is how the trouble started. He had to check out the tin of green paint on the counter-top, and then it spilled all over him. Just to be really sure, he rolled in it as well! And then, he went to the barn and got covered in lots of straw. Now Mucky Pup was green with great clumps of straw sticking to his head, so it's hardly surprising that the donkey mistook him for a monster! Luckily Mucky Pup found his friend the piglet before any more harm was done, and they plunged into the stream together, washing everything off!