Well they might and they might not but the point is that you are removing them. They will replace very quick, see if they want some UVC treatment on a monthly basis and also have their mattresses clean. You dont have to be special machines now as there is a UVC beater attachment for Vacs available.
A lot of dogs that are thought to be allergic to dustmites often have a yeast infection that is constatnly passed on from carpet, your chenicals will kill this but it will reappear in humid conditions.