Good pro tip there. Our cat rarely ever has accidents, but did have a urinary tract infection from eating too much wildlife. I'll be picking one up on the way home tonight. Your post earlier already convinced me of this.
While true, dogs have never, ever, ever, ever made a mess in the house. Cats are very well known to randomly decide to not use their litter box, even when kept pristine. I've seen this first hand. Good owners or not, cats sometimes decide to pee on stuff. Especially when they get older.
So, it's like this. If the owners are great at taking care of their animals, training them, and cleaning up after them, cats will still pee on stuff. Dogs won't.
If the owners suck, the dog, cat, house, everything smells. Definitely.
And attitude had nothing to do with your bet. I'll PM you my address for the PC Shipment.