My cat Roxy has these weird seed-like things that I notice after she has been laying on my bed or the couch. They look like the seeds from hamburger buns. I have had a big problem with fleas since I have lived in the apartment, but I am following the vets instructions to apply Advantage every 3 weeks, and keeping the place vaccuumed. I also had the pest control place come in and spray for fleas about 6 months ago. Any idea if this is related to the fleas or if it could be something else she needs to be treated for? Thank you!