EEWww. It's gross. Ruby's pants were already too long for her - I'm keeping her clipped rather than show dog length cos she is too much of a grot. Just keep brushing it.
Regular grooming should do it. I found these EXCELLENT treats at the supermarket but haven't seen them for awhile. Just little soft treats, but I fed them to her whilst on the table and she was really good.
Now she growls when I'm around her feet....dammit.

But if they are inside dogs, how can you have them with POO DAGS??