I don't know about sarcasm, I think Pippin is seriously taking the p*ss!
My chow was the worst - he thought he was a water buffalo and all sorts of stuff used to drop out of his fur. He'd go wading in the local stream and once he got wet, he'd take 3 days to dry out fully. Given the chance he'd lie outside in the mud in the pouring rain.
Flynn's not too bad, but I can only tell he's got really dirty if his tan bits disappear. He's Mr Roly Poley and delights in finding strange stuff to slamdance on top of - nothing too rancid thankfully, just old gloves or discarded mattresses. But even mud is easy to deal with as I shove him in his crate with a couple of towels on the bottom and voila - half an hour later there's a lovely clean dog waiting to be let out.
My shar-pei were the best - talk about fastidious! They wouldn't even stand in a puddle, never mind go out in the rain. I swear Phoebe was part Native American or something as she'd know if it was going to rain a good 15 minutes in advance and head for home... or not leave in the first place.