These little creatures are caused by moisture & condensation- you can buy insectercide from most house & guarden stores, but be sure it reads on the label; "also or exclusive for booklice". If you can get rid of the mosture problems involved- this will help take care of the problem. as for the dog- the lice could be the problem, but the problem could also be just allergic reaction to other parasites or even new household plants or expoure to air-born or other surface-born parasites. Check with local petshops for collars that protect against "lice" just to be on the safe side...