My dog has these little bugs on her belly...they don't jump and they don't look like any of the pictures I've seen on fleas. They look like a grain of rice in size, are brown & black, are impossible to squish unless you use your fingernails, and they don't burrow...they just scurry really fast into thicker hair. We've tried to bathe her in flea shampoo, we've tried to douse her in flea and tick repellant; however, nothing is working/killing these things AND you can only use them once a week. PLEASE HELP!