[QuickSilver]

I always thought Thor knew potty pads by smell, and have gone out of my way to always buy the same brand, but since spending time in NY, I've discovered that Thor has a pretty flimsy grasp on potty pad identifiers. I'm pretty sure he goes by (a) location, and (b) small and rectangular.

Thor has never pottied on my bath mat in SF. The first week I was in NY, I found a small yellow stain on the bath mat. I thought, okay, it is white like a potty pad, so maybe it's a little confusing. I purchased a blue mat. Several days later, that one also got marked. I thought fine, it is still kind one uniform color and size. I got a mat with a highly defined pattern and also had a lot of texture to it, so that it did not in any way look or feel like a potty pad. Needless to say, I found poop on it within hours. Soon after that, I found poop on a larger area rug, which Thor hasn't done in years.

Each of these mats was used in a different apartment, so it definitely was not a trace scent, or confusion because he'd gone there before. I think he was just in a new place and decided he was going to experiment with some different surfaces.