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If they see it a lot, then it sounds like it would be economically worth developing a version for pet owners.

Rough ideas: detect moisture in material. If soemthing 'wet' is detected on the bumper, halt. Just halt. It isn't worth it.

Otherwise, would need to have the ability to shampoo/wetvac, and that's something I don't think would work in a tiny device.

My first thought:

A poop is probably capacitive, you could detect it without even touching it.

My second thought:

What else has capacitive sensors and how could I test this theory?

...your phone screen now has poop stains on it, doesn't it.

You stay away from my phone!

I'd venture to guess that think most people that have Roombas are pet owners, so I agree it should be a high priority feature.