I lived in apt complex that did not treat lawns--moved and started my dog on Martins flee plus with igr (he takes sentinel) also it is safe to use both. Miracle-- problem was solved and good price!
Used this in conjunction with the Pernetherin spray after thoroughly cleaning rugs, pet beds, and floors for several days prior. Had dog groomed while we treated the home and applied the collar after.
No fleas seen! YAY!